diff --git a/.env.example b/.env.example
index 7e79beed..fccd2da8 100644
--- a/.env.example
+++ b/.env.example
@@ -73,6 +73,11 @@ PUPPETEER_ARGS=--no-sandbox,--disable-setuid-sandbox,--disable-dev-shm-usage,--d
 # 2.3000.1023204257 is confirmed to reach "ready" (incl. ARM64 / Raspberry Pi 5) — uncomment it:
 # WWEBJS_WEB_VERSION=2.3000.1023204257
 
+# Baileys engine (used when ENGINE_TYPE=baileys). WebSocket client, no Chromium.
+# NOTE: the Baileys engine dependency is ESM-only; OpenWA therefore requires Node >= 20.19 (require-of-ESM support).
+BAILEYS_AUTH_DIR=./data/baileys
+# NOTE: proxy (PROXY_URL/PROXY_TYPE) is not yet supported by the baileys engine; it is ignored.
+
 # Humanise single sends: show a "typing…" indicator and pause briefly (length-scaled, jittered)
 # before each text send so messages don't look instantaneous (anti-ban). ON by default — set to
 # false to disable. SIMULATE_TYPING_MAX_MS caps the pause (default 5000). Does not affect bulk
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f8972c9..16411ac1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,9 +27,11 @@ plugins instead of in core (#265).
   documented as out of scope for now). (#294)
 - **`auto-reply` reference extension plugin**, first-party and **registered disabled by default** — enable
   it via `POST /plugins/auto-reply/enable` to exercise the capability layer end-to-end. (#294)
+- **Baileys engine (minimal slice)** — `ENGINE_TYPE=baileys` now selects a second, browser-free WhatsApp engine built on `@whiskeysockets/baileys` (WebSocket/Noise protocol, no Chromium). This first slice supports linking (QR + pairing code), sending and receiving **text**, recipient resolution, and typing presence; all other operations return HTTP 501 until later slices add a message store. Config: `BAILEYS_AUTH_DIR` (default `./data/baileys`). Proxy is not yet supported on this engine. (#299)
 
 ### Changed
 
+- ⚠️ **Node.js ≥ 20.19 now required.** The Baileys engine dependency (`@whiskeysockets/baileys`) is ESM-only and is loaded at startup, so OpenWA now requires Node ≥ 20.19 (for `require()` of ESM). Operators on older Node must upgrade. (#299)
 - Engine config is now **opaque per-engine**: `EngineFactory` passes only engine-neutral fields
   (`sessionId`/`proxyUrl`/`proxyType`) to an engine plugin and supplies engine-specific config (Puppeteer
   for whatsapp-web.js) as a blob via the plugin context, so a non-browser engine can be added without the
diff --git a/package-lock.json b/package-lock.json
index 3cb8c96e..997da1b2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,6 +24,7 @@
         "@nestjs/swagger": "^11.4.4",
         "@nestjs/throttler": "^6.5.0",
         "@nestjs/typeorm": "^11.0.0",
+        "@whiskeysockets/baileys": "6.7.23",
         "archiver": "^8.0.0",
         "bullmq": "^5.78.1",
         "class-transformer": "^0.5.1",
@@ -1309,6 +1310,86 @@
         "@bull-board/api": "8.0.0"
       }
     },
+    "node_modules/@cacheable/memory": {
+      "version": "2.0.9",
+      "resolved": "https://registry.npmjs.org/@cacheable/memory/-/memory-2.0.9.tgz",
+      "integrity": "sha512-HdMx6DoGywB30vacDbBsITbIX4pgFqj1zsrV58jZBUw3klzkNoXhj7qOqAgledhxG7YZI5rBSJg7Zp8/VG0DuA==",
+      "license": "MIT",
+      "dependencies": {
+        "@cacheable/utils": "^2.4.1",
+        "@keyv/bigmap": "^1.3.1",
+        "hookified": "^1.15.1",
+        "keyv": "^5.6.0"
+      }
+    },
+    "node_modules/@cacheable/memory/node_modules/@keyv/bigmap": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/@keyv/bigmap/-/bigmap-1.3.1.tgz",
+      "integrity": "sha512-WbzE9sdmQtKy8vrNPa9BRnwZh5UF4s1KTmSK0KUVLo3eff5BlQNNWDnFOouNpKfPKDnms9xynJjsMYjMaT/aFQ==",
+      "license": "MIT",
+      "dependencies": {
+        "hashery": "^1.4.0",
+        "hookified": "^1.15.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "peerDependencies": {
+        "keyv": "^5.6.0"
+      }
+    },
+    "node_modules/@cacheable/memory/node_modules/keyv": {
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-5.6.0.tgz",
+      "integrity": "sha512-CYDD3SOtsHtyXeEORYRx2qBtpDJFjRTGXUtmNEMGyzYOKj1TE3tycdlho7kA1Ufx9OYWZzg52QFBGALTirzDSw==",
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "@keyv/serialize": "^1.1.1"
+      }
+    },
+    "node_modules/@cacheable/node-cache": {
+      "version": "1.7.6",
+      "resolved": "https://registry.npmjs.org/@cacheable/node-cache/-/node-cache-1.7.6.tgz",
+      "integrity": "sha512-6Omk2SgNnjtxB5f/E6bTIWIt5xhdpx39fGNRQgU9lojvRxU68v+qY+SXXLsp3ZGukqoPjsK21wZ6XABFr/Ge3A==",
+      "license": "MIT",
+      "dependencies": {
+        "cacheable": "^2.3.1",
+        "hookified": "^1.14.0",
+        "keyv": "^5.5.5"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@cacheable/node-cache/node_modules/keyv": {
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-5.6.0.tgz",
+      "integrity": "sha512-CYDD3SOtsHtyXeEORYRx2qBtpDJFjRTGXUtmNEMGyzYOKj1TE3tycdlho7kA1Ufx9OYWZzg52QFBGALTirzDSw==",
+      "license": "MIT",
+      "dependencies": {
+        "@keyv/serialize": "^1.1.1"
+      }
+    },
+    "node_modules/@cacheable/utils": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/@cacheable/utils/-/utils-2.4.1.tgz",
+      "integrity": "sha512-eiFgzCbIneyMlLOmNG4g9xzF7Hv3Mga4LjxjcSC/ues6VYq2+gUbQI8JqNuw/ZM8tJIeIaBGpswAsqV2V7ApgA==",
+      "license": "MIT",
+      "dependencies": {
+        "hashery": "^1.5.1",
+        "keyv": "^5.6.0"
+      }
+    },
+    "node_modules/@cacheable/utils/node_modules/keyv": {
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-5.6.0.tgz",
+      "integrity": "sha512-CYDD3SOtsHtyXeEORYRx2qBtpDJFjRTGXUtmNEMGyzYOKj1TE3tycdlho7kA1Ufx9OYWZzg52QFBGALTirzDSw==",
+      "license": "MIT",
+      "dependencies": {
+        "@keyv/serialize": "^1.1.1"
+      }
+    },
     "node_modules/@colors/colors": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.5.0.tgz",
@@ -1357,10 +1438,9 @@
       }
     },
     "node_modules/@emnapi/runtime": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.10.0.tgz",
-      "integrity": "sha512-ewvYlk86xUoGI0zQRNq/mC+16R1QeDlKQy21Ki3oSYXNgLb45GV1P6A0M+/s6nyCuNDqe5VpaY84BzXGwVbwFA==",
-      "dev": true,
+      "version": "1.11.1",
+      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.11.1.tgz",
+      "integrity": "sha512-vgj7R3y3Wgx24IQaGPA/R6YFXLHVMOZ0uVEyIQPaWs+rd1AzfEMXlAC22FYwO1XkKR6NPsq7mUandH8oIRdZFw==",
       "license": "MIT",
       "optional": true,
       "dependencies": {
@@ -1640,6 +1720,21 @@
         "node": ">=6"
       }
     },
+    "node_modules/@hapi/boom": {
+      "version": "9.1.4",
+      "resolved": "https://registry.npmjs.org/@hapi/boom/-/boom-9.1.4.tgz",
+      "integrity": "sha512-Ls1oH8jaN1vNsqcaHVYJrKmgMcKsC1wcp8bujvXrHaAqD2iDYq3HoOwsxwo09Cuda5R5nC0o0IxlrlTuvPuzSw==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@hapi/hoek": "9.x.x"
+      }
+    },
+    "node_modules/@hapi/hoek": {
+      "version": "9.3.0",
+      "resolved": "https://registry.npmjs.org/@hapi/hoek/-/hoek-9.3.0.tgz",
+      "integrity": "sha512-/c6rf4UJlmHlC9b5BaNvzAcFv7HZ2QHaV0D4/HNlBdvFnvQq8RI4kYdhyPCl7Xj+oWvTWQ8ujhqS53LIgAe6KQ==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/@humanfs/core": {
       "version": "0.19.2",
       "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.2.tgz",
@@ -1675,35 +1770,535 @@
       "dev": true,
       "license": "Apache-2.0",
       "engines": {
-        "node": ">=18.18.0"
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/@humanwhocodes/module-importer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=12.22"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
+    "node_modules/@humanwhocodes/retry": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.4.3.tgz",
+      "integrity": "sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
+    "node_modules/@img/colour": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.1.0.tgz",
+      "integrity": "sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@img/sharp-darwin-arm64": {
+      "version": "0.35.1",
+      "resolved": "https://registry.npmjs.org/@img/sharp-darwin-arm64/-/sharp-darwin-arm64-0.35.1.tgz",
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+      "optional": true,
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+      },
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+        "url": "https://opencollective.com/libvips"
+      },
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+      }
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+      }
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+      "optional": true,
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+      "resolved": "git+ssh://git@github.com/whiskeysockets/libsignal-node.git#bcea72df9ec34d9d9140ab30619cf479c7c144c7",
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/Borewit"
+        },
+        {
+          "type": "buymeacoffee",
+          "url": "https://buymeacoffee.com/borewit"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
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+        "content-type": "^2.0.0",
+        "debug": "^4.4.3",
+        "file-type": "^21.3.4",
+        "media-typer": "^2.0.0",
+        "strtok3": "^10.3.5",
+        "token-types": "^6.1.2",
+        "uint8array-extras": "^1.5.0",
+        "win-guid": "^0.2.1"
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+      "engines": {
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+    },
+    "node_modules/music-metadata/node_modules/content-type": {
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+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.0.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
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+      "license": "MIT",
+      "engines": {
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+      },
+      "funding": {
+        "type": "opencollective",
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@@ -11529,6 +12336,15 @@
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+      "license": "MIT",
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@@ -11996,6 +12812,43 @@
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+      "resolved": "https://registry.npmjs.org/pino/-/pino-9.14.0.tgz",
+      "integrity": "sha512-8OEwKp5juEvb/MjpIc4hjqfgCNysrS94RIOMXYvpYCdm/jglrKEiAYmiumbmGhCvs+IcInsphYDFwqrjr7398w==",
+      "license": "MIT",
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+        "atomic-sleep": "^1.0.0",
+        "on-exit-leak-free": "^2.1.0",
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+        "pino-std-serializers": "^7.0.0",
+        "process-warning": "^5.0.0",
+        "quick-format-unescaped": "^4.0.3",
+        "real-require": "^0.2.0",
+        "safe-stable-stringify": "^2.3.1",
+        "sonic-boom": "^4.0.1",
+        "thread-stream": "^3.0.0"
+      },
+      "bin": {
+        "pino": "bin.js"
+      }
+    },
+    "node_modules/pino-abstract-transport": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/pino-abstract-transport/-/pino-abstract-transport-2.0.0.tgz",
+      "integrity": "sha512-F63x5tizV6WCh4R6RHyi2Ml+M70DNRXt/+HANowMflpgGFMAym/VKm6G7ZOQRjqN7XbGxK1Lg9t6ZrtzOaivMw==",
+      "license": "MIT",
+      "dependencies": {
+        "split2": "^4.0.0"
+      }
+    },
+    "node_modules/pino-std-serializers": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/pino-std-serializers/-/pino-std-serializers-7.1.0.tgz",
+      "integrity": "sha512-BndPH67/JxGExRgiX1dX0w1FvZck5Wa4aal9198SrRhZjH3GxKQUKIBnYJTdj2HDN3UQAS06HlfcSbQj2OHmaw==",
+      "license": "MIT"
+    },
     "node_modules/pirates": {
       "version": "4.0.7",
       "resolved": "https://registry.npmjs.org/pirates/-/pirates-4.0.7.tgz",
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       "license": "MIT"
     },
+    "node_modules/process-warning": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/process-warning/-/process-warning-5.0.0.tgz",
+      "integrity": "sha512-a39t9ApHNx2L4+HBnQKqxxHNs1r7KF+Intd8Q/g1bUh6q0WIp9voPXJ/x0j+ZL45KF1pJd9+q2jLIRMfvEshkA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/progress": {
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       "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
@@ -12504,6 +13373,24 @@
       ],
       "license": "MIT"
     },
+    "node_modules/qified": {
+      "version": "0.10.1",
+      "resolved": "https://registry.npmjs.org/qified/-/qified-0.10.1.tgz",
+      "integrity": "sha512-+Owyggi9IxT1ePKGafcI87ubSmxol6smwJ+RAHDQlx9+9cPwFWDiKFFCPuWhr9ignlGpZ9vDQLw67N4dcTVFEA==",
+      "license": "MIT",
+      "dependencies": {
+        "hookified": "^2.1.1"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/qified/node_modules/hookified": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/hookified/-/hookified-2.2.0.tgz",
+      "integrity": "sha512-p/LgFzRN5FeoD3DLS6bkUapeye6E4SI6yJs6KetENd18S+FBthqYq2amJUWpt5z0EQwwHemidjY5OqJGEKm5uA==",
+      "license": "MIT"
+    },
     "node_modules/qrcode": {
       "version": "1.5.4",
       "resolved": "https://registry.npmjs.org/qrcode/-/qrcode-1.5.4.tgz",
@@ -12649,6 +13536,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/quick-format-unescaped": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/quick-format-unescaped/-/quick-format-unescaped-4.0.4.tgz",
+      "integrity": "sha512-tYC1Q1hgyRuHgloV/YXs2w15unPVh8qfu/qCTfhTYamaw7fyhumKa2yGpdSo87vY32rIclj+4fWYQXUMs9EHvg==",
+      "license": "MIT"
+    },
     "node_modules/range-parser": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
@@ -12818,6 +13711,15 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/real-require": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/real-require/-/real-require-0.2.0.tgz",
+      "integrity": "sha512-57frrGM/OCTLqLOAh0mhVA9VBMHd+9U7Zb2THMGdBUoZVOtGbJzjxsYGDJ3A9AYYCP4hn6y1TVbaOfzWtm5GFg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 12.13.0"
+      }
+    },
     "node_modules/redis-errors": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/redis-errors/-/redis-errors-1.2.0.tgz",
@@ -13028,6 +13930,15 @@
       ],
       "license": "MIT"
     },
+    "node_modules/safe-stable-stringify": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/safe-stable-stringify/-/safe-stable-stringify-2.5.0.tgz",
+      "integrity": "sha512-b3rppTKm9T+PsVCBEOUR46GWI7fdOs00VKZ1+9c1EWDaDMvjQc6tUwuFyIprgGgTcWoVHSKrU8H31ZHA2e0RHA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
@@ -13159,6 +14070,62 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/sharp": {
+      "version": "0.35.1",
+      "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.35.1.tgz",
+      "integrity": "sha512-lW979AMi+ESidzMv/Lnv+F9bknzLyxLqFI05Sm433vOeRcltgxQmXpnfOOFIAlKtwXU/ksupm2srQoFCkR214g==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@img/colour": "^1.1.0",
+        "detect-libc": "^2.1.2",
+        "semver": "^7.8.4"
+      },
+      "engines": {
+        "node": ">=20.9.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-darwin-arm64": "0.35.1",
+        "@img/sharp-darwin-x64": "0.35.1",
+        "@img/sharp-freebsd-wasm32": "0.35.1",
+        "@img/sharp-libvips-darwin-arm64": "1.3.0",
+        "@img/sharp-libvips-darwin-x64": "1.3.0",
+        "@img/sharp-libvips-linux-arm": "1.3.0",
+        "@img/sharp-libvips-linux-arm64": "1.3.0",
+        "@img/sharp-libvips-linux-ppc64": "1.3.0",
+        "@img/sharp-libvips-linux-riscv64": "1.3.0",
+        "@img/sharp-libvips-linux-s390x": "1.3.0",
+        "@img/sharp-libvips-linux-x64": "1.3.0",
+        "@img/sharp-libvips-linuxmusl-arm64": "1.3.0",
+        "@img/sharp-libvips-linuxmusl-x64": "1.3.0",
+        "@img/sharp-linux-arm": "0.35.1",
+        "@img/sharp-linux-arm64": "0.35.1",
+        "@img/sharp-linux-ppc64": "0.35.1",
+        "@img/sharp-linux-riscv64": "0.35.1",
+        "@img/sharp-linux-s390x": "0.35.1",
+        "@img/sharp-linux-x64": "0.35.1",
+        "@img/sharp-linuxmusl-arm64": "0.35.1",
+        "@img/sharp-linuxmusl-x64": "0.35.1",
+        "@img/sharp-webcontainers-wasm32": "0.35.1",
+        "@img/sharp-win32-arm64": "0.35.1",
+        "@img/sharp-win32-ia32": "0.35.1",
+        "@img/sharp-win32-x64": "0.35.1"
+      }
+    },
+    "node_modules/sharp/node_modules/semver": {
+      "version": "7.8.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.4.tgz",
+      "integrity": "sha512-rUCObTnP32Q08R2uuIrt7r9PlEonuTmtuXYcW6s5kjdlj3xbnwe+21yXptAUYcMAABLkYYTtnmzb3w3EDZfueA==",
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -13455,6 +14422,15 @@
         "node": ">= 10"
       }
     },
+    "node_modules/sonic-boom": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/sonic-boom/-/sonic-boom-4.2.1.tgz",
+      "integrity": "sha512-w6AxtubXa2wTXAUsZMMWERrsIRAdrK0Sc+FUytWvYAhBJLyuI4llrMIC1DtlNSdI99EI86KZum2MMq3EAZlF9Q==",
+      "license": "MIT",
+      "dependencies": {
+        "atomic-sleep": "^1.0.0"
+      }
+    },
     "node_modules/source-map": {
       "version": "0.7.4",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.4.tgz",
@@ -14210,6 +15186,15 @@
         "b4a": "^1.6.4"
       }
     },
+    "node_modules/thread-stream": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/thread-stream/-/thread-stream-3.2.0.tgz",
+      "integrity": "sha512-zLBvqpwr4Esa0kRjcrzGU6zL25lePWaCLMx0RQFrmteozIfeNdaMLpG5U7PeHzvlFkAWaRKA9/KVW4F60iB+qw==",
+      "license": "MIT",
+      "dependencies": {
+        "real-require": "^0.2.0"
+      }
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.17",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz",
@@ -15537,6 +16522,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/win-guid": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/win-guid/-/win-guid-0.2.1.tgz",
+      "integrity": "sha512-gEIQU4mkgl2OPeoNrWflcJFJ3Ae2BPd4eCsHHA/XikslkIVms/nHhvnvzIZV7VLmBvtFlDOzLt9rrZT+n6D67A==",
+      "license": "MIT"
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
diff --git a/package.json b/package.json
index 7e9570c5..9ed46369 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,9 @@
 {
   "name": "openwa",
   "version": "0.2.10",
+  "engines": {
+    "node": ">=20.19.0"
+  },
   "description": "Open Source WhatsApp API Gateway - Free, Self-Hosted HTTP API for WhatsApp",
   "author": "Yudhi Armyndharis & OpenWA Contributors",
   "private": true,
@@ -50,6 +53,7 @@
     "@nestjs/swagger": "^11.4.4",
     "@nestjs/throttler": "^6.5.0",
     "@nestjs/typeorm": "^11.0.0",
+    "@whiskeysockets/baileys": "6.7.23",
     "archiver": "^8.0.0",
     "bullmq": "^5.78.1",
     "class-transformer": "^0.5.1",
@@ -110,6 +114,10 @@
     "transform": {
       "^.+\\.(t|j)s$": "ts-jest"
     },
+    "moduleNameMapper": {
+      "^@whiskeysockets/baileys$": "<rootDir>/../test/__mocks__/@whiskeysockets/baileys.ts",
+      "^@whiskeysockets/baileys/(.*)$": "<rootDir>/../test/__mocks__/@whiskeysockets/baileys.ts"
+    },
     "collectCoverageFrom": [
       "**/*.(t|j)s"
     ],
diff --git a/src/common/errors/engine-not-supported.error.spec.ts b/src/common/errors/engine-not-supported.error.spec.ts
new file mode 100644
index 00000000..e75031f9
--- /dev/null
+++ b/src/common/errors/engine-not-supported.error.spec.ts
@@ -0,0 +1,11 @@
+import { EngineNotSupportedError } from './engine-not-supported.error';
+
+describe('EngineNotSupportedError', () => {
+  it('carries HTTP 501 so NestJS returns Not Implemented without a custom filter', () => {
+    expect(new EngineNotSupportedError('getGroups').getStatus()).toBe(501);
+  });
+
+  it('names the unsupported operation in the message', () => {
+    expect(new EngineNotSupportedError('getGroups').message).toContain('getGroups');
+  });
+});
diff --git a/src/common/errors/engine-not-supported.error.ts b/src/common/errors/engine-not-supported.error.ts
new file mode 100644
index 00000000..e2a90468
--- /dev/null
+++ b/src/common/errors/engine-not-supported.error.ts
@@ -0,0 +1,16 @@
+import { NotImplementedException } from '@nestjs/common';
+
+/**
+ * Thrown by an engine adapter when a method is part of the {@link IWhatsAppEngine}
+ * contract but the active engine cannot implement it (e.g. the Baileys engine has no
+ * self-maintained store, so history/contacts/groups are unavailable in its minimal slice).
+ *
+ * Extends NestJS `NotImplementedException` so it maps to **HTTP 501** through NestJS's
+ * built-in exception handler — no custom global filter required. Mirrors how
+ * {@link EngineNotReadyError} maps to 409.
+ */
+export class EngineNotSupportedError extends NotImplementedException {
+  constructor(method: string) {
+    super(`Operation not supported by the active engine: ${method}`);
+  }
+}
diff --git a/src/config/configuration.ts b/src/config/configuration.ts
index f08c9b35..a6c852d1 100644
--- a/src/config/configuration.ts
+++ b/src/config/configuration.ts
@@ -64,6 +64,11 @@ export default () => ({
       executablePath: process.env.PUPPETEER_EXECUTABLE_PATH || undefined,
     },
     sessionDataPath: process.env.SESSION_DATA_PATH || './data/sessions',
+    // Baileys engine (used when ENGINE_TYPE=baileys). Multi-file auth state base dir; each session
+    // gets its own subdirectory. Read by the Baileys plugin from the opaque engine config blob.
+    baileys: {
+      authDir: process.env.BAILEYS_AUTH_DIR || './data/baileys',
+    },
   },
 
   // Webhook configuration
diff --git a/src/engine/adapters/baileys-message-mapper.spec.ts b/src/engine/adapters/baileys-message-mapper.spec.ts
new file mode 100644
index 00000000..9eabe112
--- /dev/null
+++ b/src/engine/adapters/baileys-message-mapper.spec.ts
@@ -0,0 +1,110 @@
+import {
+  BaileysIncomingFields,
+  buildIncomingMessageFromBaileys,
+  mapBaileysMessageType,
+  mapBaileysStatus,
+} from './baileys-message-mapper';
+
+describe('mapBaileysMessageType (baileys content-type -> neutral MessageType)', () => {
+  it.each([
+    ['conversation', false, 'text'],
+    ['extendedTextMessage', false, 'text'],
+    ['imageMessage', false, 'image'],
+    ['videoMessage', false, 'video'],
+    ['audioMessage', false, 'audio'],
+    ['audioMessage', true, 'voice'],
+    ['documentMessage', false, 'document'],
+    ['stickerMessage', false, 'sticker'],
+    ['locationMessage', false, 'location'],
+    ['contactMessage', false, 'contact'],
+    [undefined, false, 'unknown'],
+    ['pollCreationMessage', false, 'unknown'],
+  ])('maps %s (ptt=%s) -> %s', (raw, ptt, expected) => {
+    // eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion
+    expect(mapBaileysMessageType(raw as string | undefined, ptt as boolean)).toBe(expected);
+  });
+});
+
+describe('mapBaileysStatus (proto WAMessageStatus -> neutral DeliveryStatus)', () => {
+  it.each([
+    [0, 'failed'],
+    [1, 'pending'],
+    [2, 'sent'],
+    [3, 'delivered'],
+    [4, 'read'],
+    [5, 'read'], // PLAYED collapses to read, mirroring the wwjs adapter
+  ])('maps status %s -> %s', (status, expected) => {
+    expect(mapBaileysStatus(status)).toBe(expected);
+  });
+
+  it('returns null for an unknown/absent status so the adapter skips the ack', () => {
+    expect(mapBaileysStatus(undefined)).toBeNull();
+    expect(mapBaileysStatus(99)).toBeNull();
+  });
+});
+
+describe('buildIncomingMessageFromBaileys', () => {
+  const base: BaileysIncomingFields = {
+    id: 'MSG1',
+    remoteJid: '628111@s.whatsapp.net',
+    fromMe: false,
+    body: 'hi',
+    contentType: 'conversation',
+    timestamp: 1700000000,
+    selfJid: '628999@s.whatsapp.net',
+  };
+
+  it('maps a 1:1 inbound message to the neutral shape (chatId, type, non-group)', () => {
+    const r = buildIncomingMessageFromBaileys(base);
+    expect(r.id).toBe('MSG1');
+    expect(r.chatId).toBe('628111@s.whatsapp.net');
+    expect(r.from).toBe('628111@s.whatsapp.net');
+    expect(r.to).toBe('628999@s.whatsapp.net');
+    expect(r.type).toBe('text');
+    expect(r.isGroup).toBe(false);
+    expect(r.fromMe).toBe(false);
+  });
+
+  it('inverts from/to for an outgoing (fromMe) message', () => {
+    const r = buildIncomingMessageFromBaileys({ ...base, fromMe: true });
+    expect(r.from).toBe('628999@s.whatsapp.net'); // self
+    expect(r.to).toBe('628111@s.whatsapp.net'); // chat
+  });
+
+  it('sets author to the participant for a group message and flags isGroup', () => {
+    const r = buildIncomingMessageFromBaileys({
+      ...base,
+      remoteJid: '123-456@g.us',
+      participant: '628222@s.whatsapp.net',
+    });
+    expect(r.isGroup).toBe(true);
+    expect(r.author).toBe('628222@s.whatsapp.net');
+    expect(r.chatId).toBe('123-456@g.us');
+    expect(r.from).toBe('123-456@g.us'); // group inbound: from is the group JID (mirrors wwjs)
+    expect(r.to).toBe('628999@s.whatsapp.net'); // recipient is self
+  });
+
+  it('flags an @lid 1:1 sender', () => {
+    const r = buildIncomingMessageFromBaileys({ ...base, remoteJid: '111@lid' });
+    expect(r.isLidSender).toBe(true);
+  });
+
+  it('flags an @lid group participant via participant, not the group JID', () => {
+    const r = buildIncomingMessageFromBaileys({
+      ...base,
+      remoteJid: '123-456@g.us',
+      participant: '222@lid',
+    });
+    expect(r.isLidSender).toBe(true);
+  });
+
+  it('flags a status broadcast', () => {
+    const r = buildIncomingMessageFromBaileys({ ...base, remoteJid: 'status@broadcast' });
+    expect(r.isStatusBroadcast).toBe(true);
+  });
+
+  it('carries the push name onto contact when present', () => {
+    const r = buildIncomingMessageFromBaileys({ ...base, pushName: 'Alice' });
+    expect(r.contact).toEqual({ pushName: 'Alice' });
+  });
+});
diff --git a/src/engine/adapters/baileys-message-mapper.ts b/src/engine/adapters/baileys-message-mapper.ts
new file mode 100644
index 00000000..3fab3473
--- /dev/null
+++ b/src/engine/adapters/baileys-message-mapper.ts
@@ -0,0 +1,121 @@
+import { DeliveryStatus, IncomingMessage, MessageType } from '../interfaces/whatsapp-engine.interface';
+
+/**
+ * Map a Baileys message content-type token (from `getContentType`) to the engine-neutral
+ * {@link MessageType}. `audioMessage` splits on the `ptt` flag into `voice` vs `audio`,
+ * mirroring the wwjs `ptt -> voice` mapping. Anything unmapped becomes `unknown`.
+ */
+export function mapBaileysMessageType(contentType: string | undefined, isPtt = false): MessageType {
+  switch (contentType) {
+    case 'conversation':
+    case 'extendedTextMessage':
+      return 'text';
+    case 'imageMessage':
+      return 'image';
+    case 'videoMessage':
+      return 'video';
+    case 'audioMessage':
+      return isPtt ? 'voice' : 'audio';
+    case 'documentMessage':
+    case 'documentWithCaptionMessage':
+      return 'document';
+    case 'stickerMessage':
+      return 'sticker';
+    case 'locationMessage':
+    case 'liveLocationMessage':
+      return 'location';
+    case 'contactMessage':
+    case 'contactsArrayMessage':
+      return 'contact';
+    default:
+      return 'unknown';
+  }
+}
+
+/**
+ * Map a Baileys delivery status (`proto.WebMessageInfo.Status`, numeric) to the engine-neutral
+ * {@link DeliveryStatus}. Returns `null` for an absent/unknown status so the adapter skips emitting
+ * an ack. PLAYED collapses to `read`, matching the wwjs adapter.
+ */
+export function mapBaileysStatus(status: number | null | undefined): DeliveryStatus | null {
+  switch (status) {
+    case 0:
+      return 'failed'; // ERROR
+    case 1:
+      return 'pending'; // PENDING
+    case 2:
+      return 'sent'; // SERVER_ACK
+    case 3:
+      return 'delivered'; // DELIVERY_ACK
+    case 4:
+      return 'read'; // READ
+    case 5:
+      return 'read'; // PLAYED
+    default:
+      return null;
+  }
+}
+
+/**
+ * The subset of a Baileys `WAMessage` the adapter reads (after proto extraction) to build the
+ * base of an {@link IncomingMessage}. Declared explicitly so the neutral-shape logic is
+ * unit-testable without constructing a full proto message — mirrors wwjs `RawMessageFields`.
+ */
+export interface BaileysIncomingFields {
+  id: string;
+  /** The chat JID (`key.remoteJid`): a contact, a `@g.us` group, or `status@broadcast`. */
+  remoteJid: string;
+  fromMe: boolean;
+  /** Group sender (`key.participant`); `remoteJid` is the group JID for group messages. */
+  participant?: string;
+  body: string;
+  /** Result of `getContentType(msg.message)`. */
+  contentType: string | undefined;
+  /** `audioMessage.ptt === true` — distinguishes a voice note from an audio file. */
+  isPtt?: boolean;
+  timestamp: number;
+  pushName?: string;
+  /** The account's own normalized JID, for from/to on outgoing messages. */
+  selfJid?: string;
+}
+
+/**
+ * Build a neutral {@link IncomingMessage} from extracted Baileys fields. The chat is always
+ * `remoteJid` (Baileys reports the conversation directly); `fromMe` only flips from/to. The group
+ * sender lives in `participant` (exposed as `author`), matching the wwjs convention where `from`
+ * is the group JID.
+ */
+export function buildIncomingMessageFromBaileys(fields: BaileysIncomingFields): IncomingMessage {
+  const chatId = fields.remoteJid;
+  const isGroup = chatId.endsWith('@g.us');
+  const self = fields.selfJid ?? '';
+
+  const incoming: IncomingMessage = {
+    id: fields.id,
+    from: fields.fromMe ? self : chatId,
+    to: fields.fromMe ? chatId : self,
+    chatId,
+    body: fields.body,
+    type: mapBaileysMessageType(fields.contentType, fields.isPtt),
+    timestamp: fields.timestamp,
+    fromMe: fields.fromMe,
+    isGroup,
+    isStatusBroadcast: chatId === 'status@broadcast',
+  };
+
+  if (isGroup && fields.participant) {
+    incoming.author = fields.participant;
+  }
+
+  // The real sender for an @lid check is the participant in a group, else the chat JID itself.
+  const senderJid = fields.participant ?? chatId;
+  if (senderJid.endsWith('@lid')) {
+    incoming.isLidSender = true;
+  }
+
+  if (fields.pushName) {
+    incoming.contact = { pushName: fields.pushName };
+  }
+
+  return incoming;
+}
diff --git a/src/engine/adapters/baileys.adapter.spec.ts b/src/engine/adapters/baileys.adapter.spec.ts
new file mode 100644
index 00000000..c087d1f4
--- /dev/null
+++ b/src/engine/adapters/baileys.adapter.spec.ts
@@ -0,0 +1,272 @@
+import { EventEmitter } from 'events';
+
+// A fake Baileys socket: an event emitter wearing the methods the adapter calls.
+class FakeSock extends EventEmitter {
+  public ev = {
+    on: (event: string, handler: (arg: unknown) => void) => {
+      this.emitter.on(event, handler);
+    },
+  };
+  public emitter = new EventEmitter();
+  public user: { id: string; name?: string } | undefined;
+  public requestPairingCode = jest.fn().mockResolvedValue('ABCD-EFGH');
+  public end = jest.fn();
+  public logout = jest.fn().mockResolvedValue(undefined);
+  public sendMessage = jest.fn();
+  public onWhatsApp = jest.fn();
+  public sendPresenceUpdate = jest.fn().mockResolvedValue(undefined);
+  fire(event: string, arg: unknown): void {
+    this.emitter.emit(event, arg);
+  }
+  resetEmitter(): void {
+    this.emitter.removeAllListeners();
+  }
+}
+
+const fakeSock = new FakeSock();
+const saveCreds = jest.fn().mockResolvedValue(undefined);
+
+jest.mock('@whiskeysockets/baileys', () => ({
+  __esModule: true,
+  default: jest.fn(() => fakeSock),
+  useMultiFileAuthState: jest.fn().mockResolvedValue({ state: { creds: {}, keys: {} }, saveCreds }),
+  fetchLatestBaileysVersion: jest.fn().mockResolvedValue({ version: [2, 3000, 0] }),
+  getContentType: jest.fn(() => 'conversation'),
+  DisconnectReason: { loggedOut: 401, restartRequired: 515 },
+}));
+
+import { BaileysAdapter } from './baileys.adapter';
+import { EngineStatus, EngineEventCallbacks } from '../interfaces/whatsapp-engine.interface';
+import { EngineNotReadyError } from '../../common/errors/engine-not-ready.error';
+import { EngineNotSupportedError } from '../../common/errors/engine-not-supported.error';
+
+const newAdapter = (): BaileysAdapter => new BaileysAdapter({ sessionId: 'sess-1', authDir: './data/baileys' });
+
+const noopCallbacks = (over: Partial<EngineEventCallbacks> = {}): EngineEventCallbacks => over;
+
+describe('BaileysAdapter lifecycle & status', () => {
+  beforeEach(() => {
+    fakeSock.user = undefined;
+    fakeSock.resetEmitter(); // drop listeners from previous test's initialize()
+    jest.clearAllMocks();
+  });
+
+  it('starts DISCONNECTED', () => {
+    expect(newAdapter().getStatus()).toBe(EngineStatus.DISCONNECTED);
+  });
+
+  it('emits onQRCode and moves to QR_READY on a connection.update with a qr', async () => {
+    const onQRCode = jest.fn();
+    const adapter = newAdapter();
+    await adapter.initialize(noopCallbacks({ onQRCode }));
+    fakeSock.fire('connection.update', { qr: 'QR-STRING' });
+    expect(onQRCode).toHaveBeenCalledWith('QR-STRING');
+    expect(adapter.getStatus()).toBe(EngineStatus.QR_READY);
+    expect(adapter.getQRCode()).toBe('QR-STRING');
+  });
+
+  it('captures phone/pushName and fires onReady on connection open', async () => {
+    const onReady = jest.fn();
+    const adapter = newAdapter();
+    await adapter.initialize(noopCallbacks({ onReady }));
+    fakeSock.user = { id: '628999:12@s.whatsapp.net', name: 'Me' };
+    fakeSock.fire('connection.update', { connection: 'open' });
+    expect(adapter.getStatus()).toBe(EngineStatus.READY);
+    expect(adapter.getPhoneNumber()).toBe('628999');
+    expect(adapter.getPushName()).toBe('Me');
+    expect(onReady).toHaveBeenCalledWith('628999', 'Me');
+  });
+
+  it('on a logged-out close: DISCONNECTED, onDisconnected, and NO reconnect', async () => {
+    const onDisconnected = jest.fn();
+    const adapter = newAdapter();
+    await adapter.initialize(noopCallbacks({ onDisconnected }));
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
+    const makeWASocket = jest.requireMock('@whiskeysockets/baileys').default as jest.Mock;
+    makeWASocket.mockClear();
+    fakeSock.fire('connection.update', {
+      connection: 'close',
+      lastDisconnect: { error: { output: { statusCode: 401 } } },
+    });
+    expect(adapter.getStatus()).toBe(EngineStatus.DISCONNECTED);
+    expect(onDisconnected).toHaveBeenCalled();
+    expect(makeWASocket).not.toHaveBeenCalled(); // no reconnect
+  });
+
+  it('on a recoverable close: reconnects (re-creates the socket) and does NOT fire onDisconnected', async () => {
+    const onDisconnected = jest.fn();
+    const adapter = newAdapter();
+    await adapter.initialize(noopCallbacks({ onDisconnected }));
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
+    const makeWASocket = jest.requireMock('@whiskeysockets/baileys').default as jest.Mock;
+    makeWASocket.mockClear();
+    fakeSock.fire('connection.update', {
+      connection: 'close',
+      lastDisconnect: { error: { output: { statusCode: 515 } } },
+    });
+    await new Promise(r => setImmediate(r)); // let the async connect() run
+    expect(makeWASocket).toHaveBeenCalledTimes(1);
+    expect(onDisconnected).not.toHaveBeenCalled();
+  });
+
+  it('disconnect() ends the socket and does not reconnect', async () => {
+    const adapter = newAdapter();
+    await adapter.initialize(noopCallbacks({}));
+    await adapter.disconnect();
+    expect(fakeSock.end).toHaveBeenCalled();
+    expect(adapter.getStatus()).toBe(EngineStatus.DISCONNECTED);
+  });
+
+  it('requestPairingCode throws EngineNotReadyError before initialize()', async () => {
+    const adapter = newAdapter();
+    await expect(adapter.requestPairingCode('628999')).rejects.toBeInstanceOf(EngineNotReadyError);
+  });
+
+  it('requestPairingCode delegates to the socket', async () => {
+    const adapter = newAdapter();
+    await adapter.initialize(noopCallbacks({}));
+    await expect(adapter.requestPairingCode('628999')).resolves.toBe('ABCD-EFGH');
+    expect(fakeSock.requestPairingCode).toHaveBeenCalledWith('628999');
+  });
+
+  it('persists creds: subscribes saveCreds to creds.update', async () => {
+    const adapter = newAdapter();
+    await adapter.initialize(noopCallbacks({}));
+    fakeSock.fire('creds.update', {});
+    expect(saveCreds).toHaveBeenCalled();
+  });
+});
+
+describe('BaileysAdapter capability gating', () => {
+  it('throws EngineNotSupportedError for store-backed methods (e.g. getGroups, getChats)', async () => {
+    const adapter = newAdapter();
+    await expect(adapter.getGroups()).rejects.toBeInstanceOf(EngineNotSupportedError);
+    await expect(adapter.getChats()).rejects.toBeInstanceOf(EngineNotSupportedError);
+    await expect(adapter.sendImageMessage('x', { mimetype: 'image/png', data: 'AAA' })).rejects.toBeInstanceOf(
+      EngineNotSupportedError,
+    );
+  });
+});
+
+describe('BaileysAdapter messaging', () => {
+  beforeEach(() => {
+    fakeSock.user = { id: '628999:1@s.whatsapp.net', name: 'Me' };
+    jest.clearAllMocks();
+  });
+
+  const readyAdapter = async (over: Partial<EngineEventCallbacks> = {}): Promise<BaileysAdapter> => {
+    const adapter = newAdapter();
+    await adapter.initialize(over);
+    fakeSock.fire('connection.update', { connection: 'open' });
+    return adapter;
+  };
+
+  it('sendTextMessage calls sock.sendMessage(jid, { text }) and returns the message id', async () => {
+    fakeSock.sendMessage.mockResolvedValue({ key: { id: 'OUT1' }, messageTimestamp: 1700000001 });
+    const adapter = await readyAdapter();
+    const res = await adapter.sendTextMessage('628111@s.whatsapp.net', 'hello');
+    expect(fakeSock.sendMessage).toHaveBeenCalledWith('628111@s.whatsapp.net', { text: 'hello' });
+    expect(res).toEqual({ id: 'OUT1', timestamp: 1700000001 });
+  });
+
+  it('getNumberId resolves via onWhatsApp and returns the jid when it exists', async () => {
+    fakeSock.onWhatsApp.mockResolvedValue([{ jid: '628111@s.whatsapp.net', exists: true }]);
+    const adapter = await readyAdapter();
+    await expect(adapter.getNumberId('628111')).resolves.toBe('628111@s.whatsapp.net');
+    await expect(adapter.checkNumberExists('628111')).resolves.toBe(true);
+  });
+
+  it('getNumberId returns null when the number is not on WhatsApp', async () => {
+    fakeSock.onWhatsApp.mockResolvedValue([{ jid: '628111@s.whatsapp.net', exists: false }]);
+    const adapter = await readyAdapter();
+    await expect(adapter.getNumberId('628111')).resolves.toBeNull();
+    await expect(adapter.checkNumberExists('628111')).resolves.toBe(false);
+  });
+
+  it('sendChatState maps typing -> composing presence', async () => {
+    const adapter = await readyAdapter();
+    await adapter.sendChatState('628111@s.whatsapp.net', 'typing');
+    expect(fakeSock.sendPresenceUpdate).toHaveBeenCalledWith('composing', '628111@s.whatsapp.net');
+  });
+
+  it('messaging methods throw EngineNotReadyError before the connection is open', async () => {
+    const adapter = newAdapter();
+    await adapter.initialize({});
+    await expect(adapter.sendTextMessage('x', 'y')).rejects.toBeInstanceOf(EngineNotReadyError);
+    await expect(adapter.checkNumberExists('628111')).rejects.toBeInstanceOf(EngineNotReadyError);
+    await expect(adapter.getNumberId('628111')).rejects.toBeInstanceOf(EngineNotReadyError);
+    await expect(adapter.sendChatState('628111@s.whatsapp.net', 'typing')).rejects.toBeInstanceOf(EngineNotReadyError);
+  });
+});
+
+describe('BaileysAdapter inbound fan-out', () => {
+  // eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion
+  const baileys = jest.requireMock('@whiskeysockets/baileys') as { getContentType: jest.Mock };
+
+  beforeEach(() => {
+    fakeSock.user = { id: '628999:1@s.whatsapp.net', name: 'Me' };
+    jest.clearAllMocks();
+    baileys.getContentType.mockReturnValue('conversation');
+  });
+
+  it('routes an inbound (not fromMe) message to onMessage with a neutral shape', async () => {
+    const onMessage = jest.fn();
+    const adapter = newAdapter();
+    await adapter.initialize({ onMessage });
+    fakeSock.fire('messages.upsert', {
+      type: 'notify',
+      messages: [
+        {
+          key: { remoteJid: '628111@s.whatsapp.net', fromMe: false, id: 'IN1' },
+          message: { conversation: 'hi there' },
+          messageTimestamp: 1700000002,
+          pushName: 'Alice',
+        },
+      ],
+    });
+    expect(onMessage).toHaveBeenCalledTimes(1);
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
+    const msg = onMessage.mock.calls[0][0] as { id: string; body: string; type: string; fromMe: boolean };
+    expect(msg).toMatchObject({ id: 'IN1', body: 'hi there', type: 'text', fromMe: false });
+  });
+
+  it('routes a fromMe message to onMessageCreate (outgoing), not onMessage', async () => {
+    const onMessage = jest.fn();
+    const onMessageCreate = jest.fn();
+    const adapter = newAdapter();
+    await adapter.initialize({ onMessage, onMessageCreate });
+    fakeSock.fire('messages.upsert', {
+      type: 'notify',
+      messages: [
+        {
+          key: { remoteJid: '628111@s.whatsapp.net', fromMe: true, id: 'OUT2' },
+          message: { conversation: 'sent from phone' },
+          messageTimestamp: 1700000003,
+        },
+      ],
+    });
+    expect(onMessageCreate).toHaveBeenCalledTimes(1);
+    expect(onMessage).not.toHaveBeenCalled();
+  });
+
+  it('ignores append (history) upserts', async () => {
+    const onMessage = jest.fn();
+    const adapter = newAdapter();
+    await adapter.initialize({ onMessage });
+    fakeSock.fire('messages.upsert', {
+      type: 'append',
+      messages: [
+        { key: { remoteJid: '628111@s.whatsapp.net', fromMe: false, id: 'OLD' }, message: { conversation: 'old' } },
+      ],
+    });
+    expect(onMessage).not.toHaveBeenCalled();
+  });
+
+  it('emits onMessageAck from messages.update with a neutral status', async () => {
+    const onMessageAck = jest.fn();
+    const adapter = newAdapter();
+    await adapter.initialize({ onMessageAck });
+    fakeSock.fire('messages.update', [{ key: { id: 'OUT1' }, update: { status: 3 } }]);
+    expect(onMessageAck).toHaveBeenCalledWith('OUT1', 'delivered');
+  });
+});
diff --git a/src/engine/adapters/baileys.adapter.ts b/src/engine/adapters/baileys.adapter.ts
new file mode 100644
index 00000000..0082eeec
--- /dev/null
+++ b/src/engine/adapters/baileys.adapter.ts
@@ -0,0 +1,509 @@
+import * as path from 'path';
+import makeWASocket, {
+  DisconnectReason,
+  fetchLatestBaileysVersion,
+  getContentType,
+  useMultiFileAuthState,
+} from '@whiskeysockets/baileys';
+import type { WAMessage, WASocket } from '@whiskeysockets/baileys';
+import { buildIncomingMessageFromBaileys, mapBaileysStatus } from './baileys-message-mapper';
+import type { ILogger } from '@whiskeysockets/baileys/lib/Utils/logger.js';
+import {
+  ChatState,
+  Channel,
+  ChannelMessage,
+  Catalog,
+  Contact,
+  ContactCard,
+  EngineEventCallbacks,
+  EngineStatus,
+  Group,
+  GroupInfo,
+  IncomingMessage,
+  IWhatsAppEngine,
+  Label,
+  LocationInput,
+  MediaInput,
+  MessageReaction,
+  MessageResult,
+  PaginatedProducts,
+  Product,
+  ProductQueryOptions,
+  Status,
+  StatusResult,
+  ChatSummary,
+  TextStatusOptions,
+} from '../interfaces/whatsapp-engine.interface';
+import { EngineNotReadyError } from '../../common/errors/engine-not-ready.error';
+import { EngineNotSupportedError } from '../../common/errors/engine-not-supported.error';
+import { createLogger } from '../../common/services/logger.service';
+import { BaileysAdapterConfig, BaileysLogger } from '../types/baileys.types';
+
+/** Linked-device identity shown in WhatsApp (Settings → Linked Devices). */
+const BAILEYS_BROWSER: [string, string, string] = ['OpenWA', 'Chrome', '120.0.0'];
+
+/** Fully silent logger so Baileys does not spam stdout; diagnostics flow via connection.update. */
+function createSilentLogger(): BaileysLogger {
+  const noop = (): void => {};
+  const logger: BaileysLogger = {
+    level: 'silent',
+    child: () => logger,
+    trace: noop,
+    debug: noop,
+    info: noop,
+    warn: noop,
+    error: noop,
+  };
+  return logger;
+}
+
+export class BaileysAdapter implements IWhatsAppEngine {
+  private readonly logger = createLogger('BaileysAdapter');
+  private readonly authPath: string;
+  private sock: WASocket | null = null;
+  private status: EngineStatus = EngineStatus.DISCONNECTED;
+  private qrCode: string | null = null;
+  private phoneNumber: string | null = null;
+  private pushName: string | null = null;
+  private callbacks: EngineEventCallbacks = {};
+  private intentionalClose = false;
+
+  constructor(private readonly config: BaileysAdapterConfig) {
+    // Isolate each session's auth state under its own subdirectory of the shared auth dir.
+    this.authPath = path.join(config.authDir, config.sessionId);
+    if (config.proxyUrl) {
+      // Proxy support is gated for this slice — Baileys proxying needs an http/socks agent (a new dep).
+      this.logger.warn('Proxy configured but not supported by the baileys engine in this slice; ignoring it', {
+        action: 'baileys_proxy_unsupported',
+        sessionId: config.sessionId,
+      });
+    }
+  }
+
+  // ----- Lifecycle -----
+
+  async initialize(callbacks: EngineEventCallbacks): Promise<void> {
+    this.callbacks = callbacks;
+    this.intentionalClose = false;
+    await this.connect();
+  }
+
+  private async connect(): Promise<void> {
+    this.setStatus(EngineStatus.INITIALIZING);
+    const { state, saveCreds } = await useMultiFileAuthState(this.authPath);
+    const { version } = await fetchLatestBaileysVersion();
+
+    const sock = makeWASocket({
+      auth: state,
+      version,
+      browser: BAILEYS_BROWSER,
+      printQRInTerminal: false,
+      // BaileysLogger matches ILogger exactly; cast needed because the module resolves
+      // the type through a deep import path that TypeScript does not auto-unify here.
+      // eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion
+      logger: createSilentLogger() as unknown as ILogger,
+    });
+    this.sock = sock;
+
+    // eslint-disable-next-line @typescript-eslint/no-misused-promises
+    sock.ev.on('creds.update', saveCreds);
+    sock.ev.on('connection.update', update => this.handleConnectionUpdate(update));
+    sock.ev.on('messages.upsert', event => this.handleMessagesUpsert(event));
+    sock.ev.on('messages.update', updates => this.handleMessagesUpdate(updates));
+  }
+
+  private handleConnectionUpdate(update: {
+    connection?: string;
+    qr?: string;
+    lastDisconnect?: { error?: unknown };
+  }): void {
+    const { connection, qr, lastDisconnect } = update;
+
+    if (qr) {
+      this.qrCode = qr;
+      this.setStatus(EngineStatus.QR_READY);
+      this.callbacks.onQRCode?.(qr);
+    }
+
+    if (connection === 'connecting') {
+      this.setStatus(EngineStatus.INITIALIZING);
+    }
+
+    if (connection === 'open') {
+      this.qrCode = null;
+      this.phoneNumber = this.extractPhone(this.sock?.user?.id);
+      this.pushName = this.sock?.user?.name ?? null;
+      this.setStatus(EngineStatus.READY);
+      this.callbacks.onReady?.(this.phoneNumber ?? '', this.pushName ?? '');
+    }
+
+    if (connection === 'close') {
+      const statusCode = (lastDisconnect?.error as { output?: { statusCode?: number } } | undefined)?.output
+        ?.statusCode;
+
+      if (this.intentionalClose) {
+        this.setStatus(EngineStatus.DISCONNECTED);
+        return;
+      }
+
+      if (statusCode === DisconnectReason.loggedOut) {
+        // Credentials invalidated — terminal. Re-linking requires a fresh QR/pairing.
+        this.setStatus(EngineStatus.DISCONNECTED);
+        this.callbacks.onDisconnected?.('logged out');
+        return;
+      }
+
+      // Recoverable (e.g. restartRequired right after pairing, transient drop) — reconnect.
+      // Do NOT fire onDisconnected here; this is a transient drop, not a terminal disconnect.
+      // connect() calls setStatus(INITIALIZING) which fires onStateChanged — that is the correct signal.
+      this.logger.log('Baileys connection dropped; reconnecting', { statusCode });
+      this.connect().catch(err => {
+        this.setStatus(EngineStatus.FAILED);
+        this.callbacks.onError?.(err instanceof Error ? err.message : String(err));
+      });
+    }
+  }
+
+  disconnect(): Promise<void> {
+    this.intentionalClose = true;
+    this.sock?.end(undefined);
+    this.sock = null;
+    this.setStatus(EngineStatus.DISCONNECTED);
+    return Promise.resolve();
+  }
+
+  async logout(): Promise<void> {
+    this.intentionalClose = true;
+    try {
+      await this.sock?.logout();
+    } catch (err) {
+      this.logger.warn('Baileys logout failed; ending socket', {
+        error: err instanceof Error ? err.message : String(err),
+      });
+      this.sock?.end(undefined);
+    }
+    this.sock = null;
+    this.setStatus(EngineStatus.DISCONNECTED);
+    // ponytail: leaves the multi-file auth dir on disk; a fresh link overwrites it. Add fs cleanup if
+    // stale creds ever block re-linking.
+  }
+
+  destroy(): Promise<void> {
+    this.intentionalClose = true;
+    this.sock?.end(undefined);
+    this.sock = null;
+    this.setStatus(EngineStatus.DISCONNECTED);
+    return Promise.resolve();
+  }
+
+  // ----- Status -----
+
+  getStatus(): EngineStatus {
+    return this.status;
+  }
+
+  getQRCode(): string | null {
+    return this.qrCode;
+  }
+
+  async requestPairingCode(phoneNumber: string): Promise<string> {
+    if (!this.sock) {
+      throw new EngineNotReadyError('Cannot request a pairing code before the engine is initialized.');
+    }
+    return this.sock.requestPairingCode(phoneNumber);
+  }
+
+  getPhoneNumber(): string | null {
+    return this.phoneNumber;
+  }
+
+  getPushName(): string | null {
+    return this.pushName;
+  }
+
+  // ----- Messaging -----
+
+  async sendTextMessage(chatId: string, text: string): Promise<MessageResult> {
+    this.ensureReady();
+    const sent = await this.sock!.sendMessage(chatId, { text });
+    return {
+      id: sent?.key?.id ?? '',
+      timestamp: this.toUnixSeconds(sent?.messageTimestamp),
+    };
+  }
+
+  async checkNumberExists(number: string): Promise<boolean> {
+    return (await this.getNumberId(number)) !== null;
+  }
+
+  async getNumberId(number: string): Promise<string | null> {
+    this.ensureReady();
+    const results = await this.sock!.onWhatsApp(number);
+    const hit = results?.[0];
+    return hit?.exists ? hit.jid : null;
+  }
+
+  async sendChatState(chatId: string, state: ChatState): Promise<void> {
+    this.ensureReady();
+    const presence = state === 'typing' ? 'composing' : state === 'recording' ? 'recording' : 'paused';
+    await this.sock!.sendPresenceUpdate(presence, chatId);
+  }
+
+  // ----- Gated: not supported by this minimal slice (no store) -----
+  /* eslint-disable @typescript-eslint/no-unused-vars */
+
+  sendImageMessage(_chatId: string, _media: MediaInput): Promise<MessageResult> {
+    return this.unsupported('sendImageMessage');
+  }
+  sendVideoMessage(_chatId: string, _media: MediaInput): Promise<MessageResult> {
+    return this.unsupported('sendVideoMessage');
+  }
+  sendAudioMessage(_chatId: string, _media: MediaInput): Promise<MessageResult> {
+    return this.unsupported('sendAudioMessage');
+  }
+  sendDocumentMessage(_chatId: string, _media: MediaInput): Promise<MessageResult> {
+    return this.unsupported('sendDocumentMessage');
+  }
+  sendLocationMessage(_chatId: string, _location: LocationInput): Promise<MessageResult> {
+    return this.unsupported('sendLocationMessage');
+  }
+  sendContactMessage(_chatId: string, _contact: ContactCard): Promise<MessageResult> {
+    return this.unsupported('sendContactMessage');
+  }
+  sendStickerMessage(_chatId: string, _media: MediaInput): Promise<MessageResult> {
+    return this.unsupported('sendStickerMessage');
+  }
+  replyToMessage(_chatId: string, _quotedMsgId: string, _text: string): Promise<MessageResult> {
+    return this.unsupported('replyToMessage');
+  }
+  forwardMessage(_fromChatId: string, _toChatId: string, _messageId: string): Promise<MessageResult> {
+    return this.unsupported('forwardMessage');
+  }
+  reactToMessage(_chatId: string, _messageId: string, _emoji: string): Promise<void> {
+    return this.unsupported('reactToMessage');
+  }
+  getMessageReactions(_chatId: string, _messageId: string): Promise<MessageReaction[]> {
+    return this.unsupported('getMessageReactions');
+  }
+  getContacts(): Promise<Contact[]> {
+    return this.unsupported('getContacts');
+  }
+  getContactById(_contactId: string): Promise<Contact | null> {
+    return this.unsupported('getContactById');
+  }
+  resolveContactPhone(_contactId: string): Promise<string | null> {
+    return this.unsupported('resolveContactPhone');
+  }
+  getGroups(): Promise<Group[]> {
+    return this.unsupported('getGroups');
+  }
+  getGroupInfo(_groupId: string): Promise<GroupInfo | null> {
+    return this.unsupported('getGroupInfo');
+  }
+  createGroup(_name: string, _participants: string[]): Promise<Group> {
+    return this.unsupported('createGroup');
+  }
+  addParticipants(_groupId: string, _participants: string[]): Promise<void> {
+    return this.unsupported('addParticipants');
+  }
+  removeParticipants(_groupId: string, _participants: string[]): Promise<void> {
+    return this.unsupported('removeParticipants');
+  }
+  promoteParticipants(_groupId: string, _participants: string[]): Promise<void> {
+    return this.unsupported('promoteParticipants');
+  }
+  demoteParticipants(_groupId: string, _participants: string[]): Promise<void> {
+    return this.unsupported('demoteParticipants');
+  }
+  leaveGroup(_groupId: string): Promise<void> {
+    return this.unsupported('leaveGroup');
+  }
+  setGroupSubject(_groupId: string, _subject: string): Promise<void> {
+    return this.unsupported('setGroupSubject');
+  }
+  setGroupDescription(_groupId: string, _description: string): Promise<void> {
+    return this.unsupported('setGroupDescription');
+  }
+  getGroupInviteCode(_groupId: string): Promise<string> {
+    return this.unsupported('getGroupInviteCode');
+  }
+  revokeGroupInviteCode(_groupId: string): Promise<string> {
+    return this.unsupported('revokeGroupInviteCode');
+  }
+  deleteMessage(_chatId: string, _messageId: string, _forEveryone?: boolean): Promise<void> {
+    return this.unsupported('deleteMessage');
+  }
+  getChatHistory(_chatId: string, _limit?: number, _includeMedia?: boolean): Promise<IncomingMessage[]> {
+    return this.unsupported('getChatHistory');
+  }
+  getProfilePicture(_contactId: string): Promise<string | null> {
+    return this.unsupported('getProfilePicture');
+  }
+  blockContact(_contactId: string): Promise<void> {
+    return this.unsupported('blockContact');
+  }
+  unblockContact(_contactId: string): Promise<void> {
+    return this.unsupported('unblockContact');
+  }
+  getLabels(): Promise<Label[]> {
+    return this.unsupported('getLabels');
+  }
+  getLabelById(_labelId: string): Promise<Label | null> {
+    return this.unsupported('getLabelById');
+  }
+  getChatLabels(_chatId: string): Promise<Label[]> {
+    return this.unsupported('getChatLabels');
+  }
+  addLabelToChat(_chatId: string, _labelId: string): Promise<void> {
+    return this.unsupported('addLabelToChat');
+  }
+  removeLabelFromChat(_chatId: string, _labelId: string): Promise<void> {
+    return this.unsupported('removeLabelFromChat');
+  }
+  getSubscribedChannels(): Promise<Channel[]> {
+    return this.unsupported('getSubscribedChannels');
+  }
+  getChannelById(_channelId: string): Promise<Channel | null> {
+    return this.unsupported('getChannelById');
+  }
+  subscribeToChannel(_inviteCode: string): Promise<Channel> {
+    return this.unsupported('subscribeToChannel');
+  }
+  unsubscribeFromChannel(_channelId: string): Promise<void> {
+    return this.unsupported('unsubscribeFromChannel');
+  }
+  getChannelMessages(_channelId: string, _limit?: number): Promise<ChannelMessage[]> {
+    return this.unsupported('getChannelMessages');
+  }
+  getContactStatuses(): Promise<Status[]> {
+    return this.unsupported('getContactStatuses');
+  }
+  getContactStatus(_contactId: string): Promise<Status[]> {
+    return this.unsupported('getContactStatus');
+  }
+  postTextStatus(_text: string, _options?: TextStatusOptions): Promise<StatusResult> {
+    return this.unsupported('postTextStatus');
+  }
+  postImageStatus(_media: MediaInput, _caption?: string): Promise<StatusResult> {
+    return this.unsupported('postImageStatus');
+  }
+  postVideoStatus(_media: MediaInput, _caption?: string): Promise<StatusResult> {
+    return this.unsupported('postVideoStatus');
+  }
+  deleteStatus(_statusId: string): Promise<void> {
+    return this.unsupported('deleteStatus');
+  }
+  getCatalog(): Promise<Catalog | null> {
+    return this.unsupported('getCatalog');
+  }
+  getProducts(_options?: ProductQueryOptions): Promise<PaginatedProducts> {
+    return this.unsupported('getProducts');
+  }
+  getProduct(_productId: string): Promise<Product | null> {
+    return this.unsupported('getProduct');
+  }
+  sendProduct(_chatId: string, _productId: string, _body?: string): Promise<MessageResult> {
+    return this.unsupported('sendProduct');
+  }
+  sendCatalog(_chatId: string, _body?: string): Promise<MessageResult> {
+    return this.unsupported('sendCatalog');
+  }
+  getChats(): Promise<ChatSummary[]> {
+    return this.unsupported('getChats');
+  }
+  sendSeen(_chatId: string): Promise<boolean> {
+    return this.unsupported('sendSeen');
+  }
+  deleteChat(_chatId: string): Promise<boolean> {
+    return this.unsupported('deleteChat');
+  }
+  /* eslint-enable @typescript-eslint/no-unused-vars */
+
+  // ----- Helpers -----
+
+  private handleMessagesUpsert(event: { messages: WAMessage[]; type: string }): void {
+    // Only live messages ('notify'); 'append' is history sync, which this storeless slice skips.
+    if (event.type !== 'notify') {
+      return;
+    }
+    for (const msg of event.messages) {
+      if (!msg.message || !msg.key?.remoteJid) {
+        continue; // protocol/empty messages carry no neutral content
+      }
+      const incoming = this.mapMessage(msg);
+      if (msg.key.fromMe === true) {
+        this.callbacks.onMessageCreate?.(incoming);
+      } else {
+        this.callbacks.onMessage?.(incoming);
+      }
+    }
+  }
+
+  private handleMessagesUpdate(
+    updates: Array<{ key?: { id?: string | null }; update?: { status?: number | null } }>,
+  ): void {
+    for (const u of updates) {
+      const status = mapBaileysStatus(u.update?.status);
+      if (status && u.key?.id) {
+        this.callbacks.onMessageAck?.(u.key.id, status);
+      }
+    }
+  }
+
+  private mapMessage(msg: WAMessage): IncomingMessage {
+    const content = msg.message ?? {};
+    const contentType = getContentType(msg.message ?? undefined);
+    const body = content.conversation ?? content.extendedTextMessage?.text ?? '';
+    return buildIncomingMessageFromBaileys({
+      id: msg.key.id ?? '',
+      remoteJid: msg.key.remoteJid!,
+      fromMe: msg.key.fromMe === true,
+      participant: msg.key.participant ?? undefined,
+      body,
+      contentType,
+      isPtt: content.audioMessage?.ptt === true,
+      timestamp: this.toUnixSeconds(msg.messageTimestamp),
+      pushName: msg.pushName ?? undefined,
+      selfJid: this.normalizedSelfJid(),
+    });
+  }
+
+  private normalizedSelfJid(): string {
+    const phone = this.extractPhone(this.sock?.user?.id);
+    return phone ? `${phone}@s.whatsapp.net` : '';
+  }
+
+  /** Baileys timestamps are `number | Long`; normalize to unix seconds. */
+  private toUnixSeconds(ts: number | { toNumber(): number } | null | undefined): number {
+    if (ts == null) {
+      return Math.floor(Date.now() / 1000);
+    }
+    return typeof ts === 'number' ? ts : ts.toNumber();
+  }
+
+  private unsupported(method: string): Promise<any> {
+    return Promise.reject(new EngineNotSupportedError(method));
+  }
+
+  protected ensureReady(): void {
+    if (this.status !== EngineStatus.READY || !this.sock) {
+      throw new EngineNotReadyError();
+    }
+  }
+
+  private setStatus(status: EngineStatus): void {
+    if (this.status === status) {
+      return;
+    }
+    this.status = status;
+    this.callbacks.onStateChanged?.(status);
+  }
+
+  /** `628999:12@s.whatsapp.net` / `628999@s.whatsapp.net` -> `628999`. */
+  private extractPhone(id: string | undefined): string | null {
+    if (!id) {
+      return null;
+    }
+    return id.split(':')[0].split('@')[0] || null;
+  }
+}
diff --git a/src/engine/engine.factory.spec.ts b/src/engine/engine.factory.spec.ts
index 7c74027e..fc37c28a 100644
--- a/src/engine/engine.factory.spec.ts
+++ b/src/engine/engine.factory.spec.ts
@@ -54,6 +54,22 @@ describe('EngineFactory', () => {
     );
   });
 
+  it('registers the built-in baileys engine alongside whatsapp-web.js with the opaque config blob', async () => {
+    const registerBuiltInPlugin = jest.fn();
+    const pluginLoader = {
+      registerBuiltInPlugin,
+      enablePlugin: jest.fn().mockResolvedValue(undefined),
+      getPlugin: jest.fn(),
+    } as unknown as PluginLoaderService;
+
+    const factory = new EngineFactory(buildConfigService(), pluginLoader);
+    await factory.onModuleInit();
+
+    const registeredIds = registerBuiltInPlugin.mock.calls.map(call => (call as [{ id: string }])[0].id);
+    expect(registeredIds).toContain('whatsapp-web.js');
+    expect(registeredIds).toContain('baileys');
+  });
+
   it('falls back to the direct adapter when no engine plugin is available', () => {
     const pluginLoader = {
       getPlugin: jest.fn().mockReturnValue(undefined),
diff --git a/src/engine/engine.factory.ts b/src/engine/engine.factory.ts
index 84c7bec3..c8709c9d 100644
--- a/src/engine/engine.factory.ts
+++ b/src/engine/engine.factory.ts
@@ -4,6 +4,7 @@ import { IWhatsAppEngine } from './interfaces/whatsapp-engine.interface';
 import { WhatsAppWebJsAdapter } from './adapters/whatsapp-web-js.adapter';
 import { PluginLoaderService, PluginType, IEnginePlugin, PluginManifest } from '../core/plugins';
 import { WhatsAppWebJsPlugin } from '../plugins/engines/whatsapp-web-js';
+import { BaileysPlugin } from '../plugins/engines/baileys';
 import { createLogger } from '../common/services/logger.service';
 
 export interface EngineCreateOptions {
@@ -46,6 +47,23 @@ export class EngineFactory implements OnModuleInit {
     // the plugin reads its own namespace (puppeteer.*, sessionDataPath) from context.config.
     this.pluginLoader.registerBuiltInPlugin(wwjsManifest, wwjsPlugin, this.configService.get('engine') ?? {});
 
+    // Register Baileys as a second built-in engine plugin. Same opaque engine blob; the plugin
+    // reads only its own namespace (baileys.authDir) from context.config.
+    const baileysManifest: PluginManifest = {
+      id: 'baileys',
+      name: 'Baileys Engine',
+      version: '1.0.0',
+      type: PluginType.ENGINE,
+      description: 'Baileys (WebSocket, no-browser) engine adapter',
+      main: 'index.ts',
+      provides: ['whatsapp-engine'],
+    };
+    this.pluginLoader.registerBuiltInPlugin(
+      baileysManifest,
+      new BaileysPlugin(),
+      this.configService.get('engine') ?? {},
+    );
+
     // Auto-enable the configured engine
     try {
       await this.pluginLoader.enablePlugin(this.engineType);
diff --git a/src/engine/types/baileys.types.ts b/src/engine/types/baileys.types.ts
new file mode 100644
index 00000000..b380ce6d
--- /dev/null
+++ b/src/engine/types/baileys.types.ts
@@ -0,0 +1,27 @@
+/**
+ * Per-call construction config for {@link BaileysAdapter}. Engine-neutral fields come from the
+ * factory; `authDir` is the base multi-file auth directory from the opaque `engine.baileys.*` blob
+ * (the adapter appends the session id to isolate each session).
+ */
+export interface BaileysAdapterConfig {
+  sessionId: string;
+  authDir: string;
+  proxyUrl?: string;
+  proxyType?: 'http' | 'https' | 'socks4' | 'socks5';
+}
+
+/**
+ * The minimal pino-compatible logger Baileys' `makeWASocket` expects. Declared locally so we can
+ * pass a fully silent logger without taking a direct `pino` dependency.
+ *
+ * Matches the Baileys `ILogger` contract: each log method receives `(obj: unknown, msg?: string)`.
+ */
+export interface BaileysLogger {
+  level: string;
+  child: (bindings: Record<string, unknown>) => BaileysLogger;
+  trace: (obj: unknown, msg?: string) => void;
+  debug: (obj: unknown, msg?: string) => void;
+  info: (obj: unknown, msg?: string) => void;
+  warn: (obj: unknown, msg?: string) => void;
+  error: (obj: unknown, msg?: string) => void;
+}
diff --git a/src/plugins/engines/baileys/index.spec.ts b/src/plugins/engines/baileys/index.spec.ts
new file mode 100644
index 00000000..42ba937a
--- /dev/null
+++ b/src/plugins/engines/baileys/index.spec.ts
@@ -0,0 +1,47 @@
+import type { PluginContext } from '../../../core/plugins';
+
+jest.mock('../../../engine/adapters/baileys.adapter', () => ({
+  BaileysAdapter: jest.fn().mockImplementation((config: unknown) => ({ config })),
+}));
+
+import { BaileysPlugin } from './index';
+import { BaileysAdapter } from '../../../engine/adapters/baileys.adapter';
+
+describe('BaileysPlugin.createEngine (opaque config)', () => {
+  beforeEach(() => jest.clearAllMocks());
+
+  it('reads authDir from context.config.baileys and passes neutral per-call fields', () => {
+    const plugin = new BaileysPlugin();
+    void plugin.onLoad({
+      config: { baileys: { authDir: '/data/baileys' } },
+      logger: { log: jest.fn() },
+    } as unknown as PluginContext);
+
+    plugin.createEngine({ sessionId: 'sess-1', proxyUrl: 'http://p', proxyType: 'http' });
+
+    expect(BaileysAdapter).toHaveBeenCalledWith(
+      expect.objectContaining({
+        sessionId: 'sess-1',
+        authDir: '/data/baileys',
+        proxyUrl: 'http://p',
+        proxyType: 'http',
+      }),
+    );
+  });
+
+  it('falls back to the default authDir when context has no baileys config', () => {
+    const plugin = new BaileysPlugin();
+    plugin.createEngine({ sessionId: 'sess-2' });
+    expect(BaileysAdapter).toHaveBeenCalledWith(
+      expect.objectContaining({ sessionId: 'sess-2', authDir: './data/baileys' }),
+    );
+  });
+
+  it('advertises only the minimal supported feature set', () => {
+    expect(new BaileysPlugin().getFeatures()).toEqual(['text-messages', 'typing-indicator']);
+  });
+
+  it('reports the baileys library name', () => {
+    expect(new BaileysPlugin().getEngineLibrary().name).toBe('@whiskeysockets/baileys');
+  });
+});
diff --git a/src/plugins/engines/baileys/index.ts b/src/plugins/engines/baileys/index.ts
new file mode 100644
index 00000000..21af5a7c
--- /dev/null
+++ b/src/plugins/engines/baileys/index.ts
@@ -0,0 +1,70 @@
+/**
+ * Baileys Engine Plugin
+ * Built-in engine plugin that wraps the @whiskeysockets/baileys library (minimal slice).
+ */
+
+import { PluginContext, PluginType, IEnginePlugin } from '../../../core/plugins';
+import { IWhatsAppEngine } from '../../../engine/interfaces/whatsapp-engine.interface';
+import { BaileysAdapter } from '../../../engine/adapters/baileys.adapter';
+
+export class BaileysPlugin implements IEnginePlugin {
+  type = PluginType.ENGINE as const;
+  private context?: PluginContext;
+
+  onLoad(context: PluginContext): Promise<void> {
+    this.context = context;
+    context.logger.log('Baileys engine plugin loaded');
+    return Promise.resolve();
+  }
+
+  onEnable(context: PluginContext): Promise<void> {
+    context.logger.log('Baileys engine plugin enabled');
+    return Promise.resolve();
+  }
+
+  onDisable(context: PluginContext): Promise<void> {
+    context.logger.log('Baileys engine plugin disabled');
+    return Promise.resolve();
+  }
+
+  createEngine(config: Record<string, unknown>): IWhatsAppEngine {
+    const sessionId = config.sessionId as string;
+    const proxyUrl = config.proxyUrl as string | undefined;
+    const proxyType = config.proxyType as 'http' | 'https' | 'socks4' | 'socks5' | undefined;
+
+    // Baileys' own config namespace, read from the opaque per-engine blob the factory supplies via
+    // context.config (the `engine` sub-tree in configuration.ts). Per-call config carries only
+    // engine-neutral fields (sessionId, proxy).
+    const engineConfig = (this.context?.config ?? {}) as { baileys?: { authDir?: string } };
+    const authDir = engineConfig.baileys?.authDir ?? './data/baileys';
+
+    return new BaileysAdapter({
+      sessionId,
+      authDir,
+      proxyUrl,
+      proxyType,
+    });
+  }
+
+  getFeatures(): string[] {
+    // Minimal slice: text send/receive + typing presence. Everything else throws 501.
+    return ['text-messages', 'typing-indicator'];
+  }
+
+  getEngineLibrary(): { name: string; version: string } {
+    let version = 'unknown';
+    try {
+      // eslint-disable-next-line @typescript-eslint/no-require-imports
+      version = (require('@whiskeysockets/baileys/package.json') as { version: string }).version;
+    } catch {
+      // Keep 'unknown' if the package metadata can't be resolved at runtime.
+    }
+    return { name: '@whiskeysockets/baileys', version };
+  }
+
+  healthCheck(): Promise<{ healthy: boolean; message?: string }> {
+    return Promise.resolve({ healthy: true, message: 'Baileys engine is available' });
+  }
+}
+
+export default BaileysPlugin;
diff --git a/src/plugins/engines/baileys/manifest.json b/src/plugins/engines/baileys/manifest.json
new file mode 100644
index 00000000..14adc10d
--- /dev/null
+++ b/src/plugins/engines/baileys/manifest.json
@@ -0,0 +1,21 @@
+{
+    "id": "baileys",
+    "name": "Baileys Engine",
+    "version": "1.0.0",
+    "type": "engine",
+    "description": "Baileys (WebSocket, no-browser) engine adapter for OpenWA — minimal slice: text send/receive",
+    "author": "OpenWA Team",
+    "main": "index.ts",
+    "provides": ["whatsapp-engine", "text-messages"],
+    "configSchema": {
+        "type": "object",
+        "properties": {
+            "authDir": {
+                "type": "string",
+                "title": "Auth Directory",
+                "description": "Base directory for Baileys multi-file auth state (per-session subdirs)",
+                "default": "./data/baileys"
+            }
+        }
+    }
+}
diff --git a/test/__mocks__/@whiskeysockets/baileys.ts b/test/__mocks__/@whiskeysockets/baileys.ts
new file mode 100644
index 00000000..16dc8b0e
--- /dev/null
+++ b/test/__mocks__/@whiskeysockets/baileys.ts
@@ -0,0 +1,16 @@
+/**
+ * Unit-test stub for @whiskeysockets/baileys (ESM-only package).
+ * ts-jest runs in CommonJS mode; this stub prevents "Cannot use import statement outside a module"
+ * when any source file importing baileys is pulled into the unit test graph.
+ * The e2e boot gate uses jest.mock() inline instead (test/baileys-engine.e2e-spec.ts).
+ *
+ * Note: the jest moduleNameMapper also redirects the `@whiskeysockets/baileys/(.*)` subpath
+ * (including `/package.json`) to this stub, so BaileysPlugin.getEngineLibrary() returns an
+ * undefined version in unit tests by design. Production reads the real package.json via the
+ * unmapped require.
+ */
+export default jest.fn();
+export const useMultiFileAuthState = jest.fn();
+export const fetchLatestBaileysVersion = jest.fn();
+export const getContentType = jest.fn();
+export const DisconnectReason = { loggedOut: 401 };
diff --git a/test/baileys-engine.e2e-spec.ts b/test/baileys-engine.e2e-spec.ts
new file mode 100644
index 00000000..f6ec4f4e
--- /dev/null
+++ b/test/baileys-engine.e2e-spec.ts
@@ -0,0 +1,59 @@
+// archiver v8 is ESM-only (pulled in transitively via @Global StorageModule); stub for ts-jest CJS.
+jest.mock('archiver', () => ({ TarArchive: jest.fn() }));
+// Stub the heavy Baileys lib: the boot gate only verifies registration/enable, never a socket connect.
+jest.mock('@whiskeysockets/baileys', () => ({
+  __esModule: true,
+  default: jest.fn(),
+  useMultiFileAuthState: jest.fn(),
+  fetchLatestBaileysVersion: jest.fn(),
+  getContentType: jest.fn(),
+  DisconnectReason: { loggedOut: 401 },
+}));
+
+import { Test, TestingModule } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import { App } from 'supertest/types';
+import { AppModule } from './../src/app.module';
+import { EngineFactory } from './../src/engine/engine.factory';
+
+/**
+ * Boots the real app module graph with ENGINE_TYPE=baileys. This is the integration gate: it proves
+ * the second registration block + config wiring boot cleanly (the DI module-load cycle only surfaces
+ * at full boot) without the Baileys socket ever connecting (AUTO_START_SESSIONS=false; lib mocked).
+ */
+describe('Baileys engine boot (e2e)', () => {
+  let app: INestApplication<App>;
+  let factory: EngineFactory;
+  const prevEngine = process.env.ENGINE_TYPE;
+
+  beforeAll(async () => {
+    process.env.ENGINE_TYPE = 'baileys';
+    const moduleFixture: TestingModule = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+    app = moduleFixture.createNestApplication();
+    await app.init();
+    factory = moduleFixture.get(EngineFactory);
+  });
+
+  afterAll(async () => {
+    process.env.ENGINE_TYPE = prevEngine;
+    try {
+      await app?.close();
+    } catch {
+      /* ignore teardown-only multi-datasource quirk */
+    }
+  });
+
+  it('selects baileys as the current engine', () => {
+    expect(factory.getCurrentEngine()).toBe('baileys');
+  });
+
+  it('registers and enables the baileys engine plugin', () => {
+    const engines = factory.getAvailableEngines();
+    const baileys = engines.find(e => e.id === 'baileys');
+    expect(baileys).toBeDefined();
+    expect(baileys?.enabled).toBe(true);
+    expect(baileys?.features).toEqual(['text-messages', 'typing-indicator']);
+  });
+});