Senior Python Backend Engineer - Transactional Systems

Supero; San Francisco (CA); Hybrid; USD 140,000 - 190,000; Full time

Job summary

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

Qualifications

• 5+ years of production backend engineering with distributed systems experience.
• Deep Python across multiple eras: FastAPI/Pydantic and legacy Bottle on gunicorn/gevent.
• Strong API contract discipline and error handling.

Responsibilities

• Own the transactional services end to end (cart, orders, payments, inventory).
• Ensure idempotency, correctness, and safe compensation flows.
• Model a multi-tenant path with MongoDB Atlas and PostgreSQL JSONB.
• Design and secure the MCP surface accessed by external agents.
• Tune performance, reliability and concurrency handling.

Skills

Distributed systems

Python backend

Asyncio

API design

MongoDB

PostgreSQL JSONB

Testing

Tools

FastAPI

Pydantic

Bottle

gunicorn/gevent

MongoDB Atlas

PostgreSQL

Kafka

Job description

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