architecture-patterns

Use Hexagonal Architecture and ports-and-adapters to isolate domain logic from external interfaces. This pattern defines clear boundaries, ensuring dependencies point inward toward the domain, which improves system testability and maintainability.

Review your service boundary first, then apply the selected pattern to define clear boundaries and ports. Structure your domain logic, use cases, and adapters according to the dependency rules demonstrated through concrete examples to ensure reliable system evolution.

You do not need any external dependencies to apply these backend architecture patterns. The approach consolidates Clean Architecture, Hexagonal Architecture, and Domain-Driven Design into a practical methodology focused on structuring domain logic and adapters within your services.

Limitations arise when applying these patterns to small services with minimal domain logic, as the overhead of defining bounded contexts, ports, and adapters outweighs maintainability benefits. Avoid forcing Clean Architecture or Domain-Driven Design when service boundaries are trivial and lack complex domain events.