backend-dev-guidelines

Layered architecture enforcement separates routes, controllers, services, and repositories in Express and TypeScript services. This prevents business logic from leaking into HTTP handlers and maintains predictable service structure.

Zod input validation provides strong validation discipline for API requests. By applying Zod alongside centralized configuration, you reduce runtime failures and ensure predictable data structures across your backend services.

Prisma repository usage guides database access patterns by implementing dependency injection and transactions. This approach ensures testable service design for common backend workflows while maintaining clear separation from business logic.

Yes, this backend architecture approach integrates Sentry-backed error handling to capture failures consistently. Combined with Zod validation and unified configuration, it enforces error discipline to reduce runtime failures in production services.

Dependency injection is needed when designing testable backend services with predictable structure. It enables isolated testing of business logic by injecting repository dependencies, ensuring services remain maintainable under real traffic.