golang-enterprise-patterns

Clean architecture in Go organizes code into layers—domain, application, and infrastructure—with dependencies pointing inward. This layered structure isolates business logic from frameworks, making applications testable and maintainable as complexity grows.

Hexagonal architecture uses ports and adapters to decouple domain logic from external systems. In Go, this means defining interfaces for database and API interactions, letting you swap implementations without changing core business rules.

Domain-Driven Design structures Go codebases around business domains, not technical layers. Define clear domain boundaries, aggregate roots, and value objects; use interfaces to enforce dependency rules so each domain remains independently testable and composable.

Yes. Go's interface-based design and lack of reflection overhead make dependency injection feasible without frameworks. Wire dependencies explicitly at application startup to maintain testability and control over object construction in production-ready code.

Enforce the dependency rule strictly—inner layers must not import outer ones. Package naming must reflect domain boundaries, not directory structure. Avoid circular imports and tight coupling to HTTP or database drivers in domain logic.

Isolate domain logic in pure functions or methods with no I/O side effects. Use interfaces for external dependencies, inject mocks in tests, and verify behavior at the domain layer before testing integrations with databases or APIs.