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Clean architecture in FastAPI, by example

Mar 2025 ยท 8 min read

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Strategy, Repository, Service Layer and Factory patterns in a real Python project.

Clean architecture isn't academic โ€” it's what keeps a codebase testable and changeable as it grows. Using patterns from a real project, we walk through how the Repository pattern isolates data access, how the Service Layer holds business logic, how Strategy keeps behavior swappable, and how Factory wires it all together in a FastAPI app.

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