hexagonal-architecture

You decouple business logic from infrastructure by implementing the ports and adapters pattern, which isolates domain layers and ensures application logic remains independent of external frameworks and databases through dependency inversion.

The best way to refactor legacy code tightly coupled to an ORM is applying hexagonal architecture by defining domain entities and port interfaces before implementing infrastructure adapters, allowing you to swap frameworks without rewriting core business logic.

Yes, the ports and adapters pattern works with Kotlin and Go environments, providing architectural patterns and mapping strategies across TypeScript, Java, Kotlin, and Go to facilitate testable and modular systems.

Tightly coupled code makes systems difficult to test and maintain because business rules become entangled with external APIs and databases, preventing isolated testing and requiring full infrastructure availability to validate domain logic.

Set up domain isolation by defining inbound and outbound ports to establish clear boundaries between application logic and external systems, keeping business rules pure and completely free from infrastructure dependencies.