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FastAPI excels at building scalable microservices through its asynchronous capabilities, built-in data validation with Pydantic, and automatic API documentation. Key practices include layered architecture, domain-driven design, and service independence. Security is handled through OAuth2/JWT authentication, while performance optimization leverages async requests, caching, and database optimization. The framework supports comprehensive testing with pytest, containerization with Docker, and CI/CD pipelines for reliable deployment across various use cases from e-commerce to healthcare.