Building a Multi-Container Backend System with Docker Compose Modern backend systems rarely operate as a single process runtime. Most production-grade architectures depend on multiple isolated services communicating over internal networks with persistent state management and deterministic deployment workflows. This implementation focused on building a reproducible multi-container backend stack using Docker Compose. Stack Overview Application Layer Flask REST API Python runtime containerization Dockerfile-based image builds Data Layer PostgreSQL service container Persistent named volumes Stateful data durability Infrastructure Layer Docker Compose orchestration Internal bridge networking Service discovery Port exposure and container isolation System Architecture Client Request ↓ Flask API Container ↓ Docker Internal Network ↓ PostgreSQL Container ↓ Persistent Docker Volume The architecture separates application runtime concerns from data persistence concerns while maintaining deterministic service…