Senior ML Engineer: LLM Systems & RAG Pipelines

Oscar is seeking a Senior Software Engineer to design, build and operate LLM-powered workflows for an AI work-execution platform. You will work in Python/FastAPI with LangGraph and LangChain across model providers, focusing on low latency, auditability and cost control.

You will own production RAG pipelines, graph retrieval, and mentor engineers while collaborating with the Executive Committee. Role is based in London’s King’s Cross office with competitive compensation and a strong focus on