This is a full-stack, cloud-native web application for tracking and splitting expenses and settling debts among 2 individuals. It is built on PHP 8.4, Symfony 8, MySQL 8, and React 19, and uses event sourcing to maintain a complete audit trail of all financial transactions.
It follows DDD principles to separate the application into generic, core, and supporting domains — enforced by deptrac. This makes it easy to achieve full code coverage for the core domain.
It also showcases Kubernetes deployment using Helm.
 |
 |
 |
- Make
- Docker
- Kubernetes (kind, minikube, or Docker Desktop)
- Helm 3
make start # Build images, start services, and open in browser
make help # Show all available targetsVisit http://localhost:8000 in your browser.
Browser / Client
│
┌────────────────┼─────────────────┐
│ :8000 │ :8080 │ :5173 (dev)
▼ ▼ ▼
┌────────────┐ ┌──────────────┐ ┌───────────────┐
│ dashboard │ │ web (Nginx) │ │ npm-dev │
│ (Homer) │ │ │ │ (Vite/React/ │
└────────────┘ └──────┬───────┘ │ TypeScript) │
│ FastCGI └───────────────┘
│ :9000
▼
┌──────────────────┐ async ┌──────────────┐
│ app (PHP-FPM) │────messages────▶│ worker │
│ Symfony │ │ (Messenger) │
└──────────────────┘ └──────────────┘
│ │
└────────────────┬────────────────┘
│ SQL
▼
┌─────────────────┐
│ db (MySQL) │
└─────────────────┘
───────────────────────── Backend Layers ─────────────────────────
┌─────────────────────────────────────────────────────────────────┐
│ Supporting │ Controllers · Auth · Repositories · Async │
│ │ Normalizers · Instrumentation · EventListeners │
├──────────────┴──────────────────────────────────────────────────┤
│ Core │ ExpenseTracker · Calculator │
│ (Domain) │ Event Sourcing · Expenses · Compensation │
├──────────────┴──────────────────────────────────────────────────┤
│ Generic │ Symfony · Doctrine · Twig · DomPDF · Monolog |
| │ PhpParser · phpDocumenter · OpenAPI |
└─────────────────────────────────────────────────────────────────┘
Supporting depends on Core & Generic · Core has no deps
# Build production images
make prod
# Deploy to cluster
helm install app ./helm
# or:
helm upgrade --install app ./helm
# Watch pods come up
kubectl get pods -w
# View logs for all pods with the PHP label (app + worker)
kubectl logs -f -l technology=php
# Access the application via NodePort:
# Link: http://localhost:30190
# Or configure port forwarding via:
kubectl port-forward svc/app-split-fairly-web 8080:80
# Link: http://localhost:8080┌────────────────────────────────────────────────────────────────────────┐
│ Kubernetes Cluster │
├────────────────────────────────────────────────────────────────────────┤
│ │
│ ┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐ │
│ │ nginx (web) │ │ app (PHP-FPM) │ │ worker │ │
│ │ Deployment │ │ Deployment │ │ (Messenger) │ │
│ │ NodePort:30190 │ │ Pod × 1 │ │ Pod × 1 │ │
│ │ Pods × 1 │─→│ FastCGI :9000 │ │ One-shot pattern │ │
│ └──────────────────┘ └──────────────────┘ └──────────────────┘ │
│ │ │ │ │
│ │ Serves SPA │ Business logic │ Async tasks │
│ │ EasyAdmin │ API endpoints │ from queue │
│ │ Static assets │ Session mgmt (DB) │ │
│ │ │ Event sourcing (DB) │ │
│ │ │ │ │
│ └───────────┬───────────┴───────────┬───────────┘ │
│ │ │ │
│ ┌──────▼───────────────────────▼──┐ │
│ │ MySQL StatefulSet │ │
│ │ PVC Storage (8Gi) │ │
│ │ - Event store │ │
│ │ - Sessions │ │
│ │ - Application data │ │
│ └─────────────────────────────────┘ │
│ △ │
│ │ init Job │
│ ┌──────┴──────┐ │
│ │ db-init │ │
│ │ (one-time) │ │
│ └─────────────┘ │
│ │
│ ┌──────────────────────────────────────────────────────────────┐ │
│ │ Grafana Alloy (k8s-monitoring) │ │
│ │ - Collects logs from all pods │ │
│ │ - Metrics collection & forwarding │ │
│ └──────────────────────────────────────────────────────────────┘ │
│ │
└────────────────────────────────────────────────────────────────────────┘
Components:
- nginx (web): Serves React SPA frontend, static assets, EasyAdmin UI. Proxies API requests to PHP-FPM via FastCGI.
- PHP-FPM (app): Symfony backend handling business logic, API endpoints, and session management. Stores sessions in MySQL.
- Worker: Processes async jobs via Messenger with one-shot pattern (processes single message per pod lifecycle, then restarts for fresh environment).
- MySQL: Persistent data storage with StatefulSet and PVC. Stores event sourcing audit trail, sessions, and application data.
- db-init Job: One-time database initialization (schema, fixtures, migrations).
- Grafana Alloy: Log collection and forwarding for observability across all cluster components.