codebase-design

Deep modules hide implementation complexity behind focused interfaces, reducing overall code complexity. You need this architectural approach when refactoring scattered logic to improve testability, establish clear seams, and create more maintainable module boundaries in your software architecture.

Improve testability by evaluating module boundaries and placing effective seams using adapters and interface-focused design. This isolates dependencies for independent module testing and establishes maintainable implementations within your codebase architecture.

Manage dependencies by applying consistent architectural vocabulary for modules, interfaces, and adapters. This identifies deepening opportunities and establishes maintainable seams that improve locality and leverage across your software architecture.

Yes, you can use interface-focused design to analyze modules with scattered logic. It guides you to compare interface designs, evaluate module depth, and restructure boundaries to achieve a maintainable architecture with improved testability.

Avoid deep module design when your existing architectural vocabulary is inconsistent or when refactoring simple, shallow modules that do not require complex seams, adapters, or heavy dependency management overhead.