Senior/Lead Python BE

Overhedge is looking for a strong Python developer for a long-term client project (US client).

About the project. An AI avatar platform: users create a video avatar. Heavy third-party integrations, high concurrency expected from launch. This is not an MVP: part of the codebase already exists and needs to be taken over, extended, and scaled for real traffic.

It is not a web3 project.

Stack:

• Python, FastAPI (async code is a must)
• PostgreSQL
• Celery or similar queues (RabbitMQ, Redis) — long-running background jobs, video generation up to ~30 minutes
• AWS, Docker
• LiveKit / WebRTC for the video part (deep knowledge is a plus, not required)
• Mandatory AI integrations: OpenAI and other LLM APIs, Langchain, RAG, tool calling, structured outputs.

What we expect:

• 5+ years of experience with Python as your primary language, not a secondary one
• solid asyncio understanding: event loop, coroutines, what a blocking call inside a coroutine does
• real experience with Celery or equivalents for long-running tasks
• API resilience: retries and backoff, circuit breakers, webhooks (idempotency, out-of-order handling)
• English B2+: you will communicate with the team and the client in English
• production AI-integration experience is a strong plus
• readiness to grow into the tech-lead role on this track is a plus

Terms:

• full-time, fully remote
• start: a paid ~2-week trial, then a 4-month contract moving to open-ended
• process: a 15-minute intro call, then a technical interview (~1.5h, live coding plus discussion, no take-home task)