Senior Python Backend Engineer - Transactional Systems

Supero is seeking a senior backend engineer in San Francisco, focused on building and securing complex transactional services that manage orders, payments, inventory, and ledgers. You will work with Python across FastAPI, Pydantic, and legacy Bottle code, ensuring correctness under concurrency and delivering reliable two-phase commit like flows. You will own idempotent semantics, saga compensation where needed, and a multi-tenant data path using MongoDB Atlas and PostgreSQL JSONB, with a focus