Clean Architecture has been gaining popularity, and for good reason. This quarter, we applied it to refactor a mid-sized Spring Boot service that had become a tangled mess of controllers doing too much.
Key principles we implemented:
- Clear separation of domain, application, and infrastructure layers
- Dependency inversion using interfaces for data access and external systems
- Keeping domain logic free of annotations and framework noise
Sample structure:
├── domain ├── application ├── infrastructure └── api
Benefits? Easier unit testing, fewer merge conflicts, and a much cleaner mental model.