python-project-structure

To enforce Clean Architecture in a FastAPI project, use import-linter to define and validate inward-only dependency rules, ensuring domain logic remains isolated from infrastructure concerns like SQL and Kafka.

The best way to structure a testable FastAPI service is implementing a four-layer project layout with a composition root and port-adapter structure, decoupling domain models from infrastructure for isolated testing.

Prevent architectural drift in Python backend services by standardizing the project layout with a strict src/ package structure and applying CI-gated architectural enforcement using import-linter fitness functions.

Yes, you can use typing.Protocol for dependency inversion in FastAPI to define structural typing boundaries, ensuring use cases depend on abstract ports rather than concrete infrastructure adapters.

Yes, import-linter supports enforcing architectural boundaries in Python by validating that dependencies flow inward across layers, preventing infrastructure and framework code from polluting isolated domain logic.

Decouple domain logic from FastAPI and SQL by wiring dependencies through a composition root, isolating domain models in an inner layer that only interacts with external systems via defined ports.