clean-ddd-hexagonal

Structure your backend with Clean Architecture and DDD by organizing code into Domain, Application, Infrastructure, and Presentation layers. Ensure inward dependencies only and define explicit ports to isolate core domain logic from outer infrastructure adapters.

Use hexagonal architecture when your backend service has multiple entry points like API, CLI, or events, and requires evolving infrastructure. It enforces domain boundaries via ports and adapters, enabling teams to replace outer layers without touching core domain logic.

The best way to isolate domain logic is applying hexagonal architecture patterns with explicit ports and adapters. This enforces inward dependencies only, keeping business rules isolated and enabling easy swapping of infrastructure components without affecting the core domain.

Apply CQRS and domain events within the Application layer of a hexagonal architecture by defining ports for command and query separation. Use domain events to communicate between bounded contexts while maintaining strict inward dependency rules and clear layering.

Yes, you can refactor a monolithic backend into bounded contexts by applying strategic DDD patterns and hexagonal architecture. Explicit ports and adapters allow replacing or modifying infrastructure and presentation layers without touching the core domain logic.

Combining Clean Architecture, DDD, and Hexagonal patterns introduces significant structural overhead through explicit ports, adapters, and strict layering. This blueprint is suited for large, evolving backend services with multiple entry points, not for simple or small-scale applications.