diff --git a/cmd/api/handlers/v1/config.go b/cmd/api/handlers/v1/config.go
index 7efe623..4d28dcf 100644
--- a/cmd/api/handlers/v1/config.go
+++ b/cmd/api/handlers/v1/config.go
@@ -172,6 +172,11 @@ func parseConfigArgs(c *fiber.Ctx) (*configArgs, error) {
 		return nil, fmt.Errorf("could not parse total ram: %w", err)
 	}
 
+	envName, err := profile.Parse(c.Query("environment_name", "WEB"))
+	if err != nil {
+		return nil, fmt.Errorf("could not parse environment name: %w", err)
+	}
+
 	// Set default log format based on PostgreSQL version
 	defaultLogFormat := "stderr"
 	if float32(pgVersion) >= 15.0 {
@@ -182,7 +187,7 @@ func parseConfigArgs(c *fiber.Ctx) (*configArgs, error) {
 		pgVersion:       float32(pgVersion),
 		totalRAM:        parsedRAM,
 		maxConn:         maxConn,
-		envName:         profile.Profile(c.Query("environment_name", "WEB")),
+		envName:         envName,
 		osType:          c.Query("os_type", "linux"),
 		arch:            c.Query("arch", "amd64"),
 		driveType:       c.Query("drive_type", "HDD"),
diff --git a/cmd/api/handlers/v1/config_test.go b/cmd/api/handlers/v1/config_test.go
new file mode 100644
index 0000000..8e2921c
--- /dev/null
+++ b/cmd/api/handlers/v1/config_test.go
@@ -0,0 +1,69 @@
+package v1
+
+import (
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gofiber/fiber/v2"
+	"github.com/pgconfig/api/pkg/input/profile"
+)
+
+func TestParseConfigArgs_ProfileCaseInsensitive(t *testing.T) {
+	// Regression test for issue #37: environment_name should be case-insensitive
+	tests := []struct {
+		name            string
+		environmentName string
+		expectedProfile profile.Profile
+	}{
+		{
+			name:            "uppercase MIXED",
+			environmentName: "MIXED",
+			expectedProfile: profile.Mixed,
+		},
+		{
+			name:            "mixed case Mixed",
+			environmentName: "Mixed",
+			expectedProfile: profile.Mixed,
+		},
+		{
+			name:            "lowercase mixed",
+			environmentName: "mixed",
+			expectedProfile: profile.Mixed,
+		},
+		{
+			name:            "mixed case WEB",
+			environmentName: "Web",
+			expectedProfile: profile.Web,
+		},
+		{
+			name:            "lowercase web",
+			environmentName: "web",
+			expectedProfile: profile.Web,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			app := fiber.New()
+
+			app.Get("/test", func(c *fiber.Ctx) error {
+				args, err := parseConfigArgs(c)
+				if err != nil {
+					return err
+				}
+
+				if args.envName != tt.expectedProfile {
+					t.Errorf("expected profile %v, got %v", tt.expectedProfile, args.envName)
+				}
+
+				return c.SendStatus(200)
+			})
+
+			req := httptest.NewRequest("GET", "/test?environment_name="+tt.environmentName, nil)
+			_, err := app.Test(req)
+			if err != nil {
+				t.Fatalf("request failed: %v", err)
+			}
+		})
+	}
+}
diff --git a/pkg/input/profile/profile.go b/pkg/input/profile/profile.go
index 9d3b433..c97d2a0 100644
--- a/pkg/input/profile/profile.go
+++ b/pkg/input/profile/profile.go
@@ -53,3 +53,14 @@ func (e *Profile) Set(v string) error {
 func (e *Profile) Type() string {
 	return "Profile"
 }
+
+// Parse parses a profile string and returns the normalized Profile.
+// It normalizes the input to uppercase to ensure case-insensitive matching.
+// Returns an error if the profile string is not valid.
+func Parse(s string) (Profile, error) {
+	var p Profile
+	if err := p.Set(s); err != nil {
+		return "", err
+	}
+	return p, nil
+}