codebase-design

You design deep modules by establishing minimal interfaces that encapsulate high internal complexity, applying ports and adapters to identify seams, and ensuring testability through dependency injection and side-effect avoidance.

Evaluating alternative interface designs involves exploring multiple radically different architectural approaches in parallel. This design exploration ensures you select the most robust interface before committing to a final codebase structure.

Refactoring tightly coupled codebases requires identifying structural seams and applying a standardized architectural framework. This process deepens shallow modules by defining clear interfaces and establishing strict design discipline across the codebase.

You apply architectural seams and ports and adapters when your codebase becomes tightly coupled and difficult to test. This approach isolates dependencies, establishes clear locality for maintainers, and provides high leverage for callers.

Testability guidance for new features is handled by offering principles that make testing natural, such as implementing dependency injection and avoiding side effects. This ensures consistent design discipline during development.