Principal Python LangGraph Engineer @ apreel Sp. z o.o.

Must-have skills 7 years Python in production at senior level Deep LangGraph experience — state graphs, checkpoints, interrupts, multi-agent supervision, subgraphs Strong LangChain ecosystem knowledge (chains, tools, memory, output parsers, callbacks) Production FastAPI — streaming responses, dependency injection, middleware, async patterns Celery Redis broker in production — task ordering, retries, idempotency, priority queues, dead-letter handling Concurrency in Python — asyncio (gather, str…