Implement authentication and authorization (OAuth 2.0/JWT), role‑based access control, and secure data flows aligned with industry compliance. * Security‑minded engineering: OAuth 2.0/JWT, RBAC, secure coding practices, and handling of PII/compliance considerations. * Design and implement RESTful APIs (and WebSockets where appropriate) using FastAPI with clear versioning, pagination, validation, and error handling. * WebSockets, background workers (Celery/RQ), and caching (Redis) for responsiveness and scale.
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