Senior​/Principal AI Engineer

Senior / Principal AI Engineer (x2) - London (Hybrid) - Python, Lang Graph, Type Script, PostgreSQL, GCP

£90,000 - £150,000

I'm partnering with a well-funded AI scale-up that has just secured a major investment round and has the ambition to become a category-defining company. They're building an enterprise AI platform that helps large organisations get real, measurable value from AI, using intelligent agents to automate work at scale.

This is a rare chance to join at an early stage, with serious backing and a clear vision. You'll work directly with an experienced CTO from a blue-chip technology background, who is building the team in person in London. The business is scaling quickly across Tech, Product and Marketing, so you'll help shape a team of the best people in the market.

The office is state of the art, in the heart of the City, and somewhere people want to come in to work.

You will work with

• Designing and building complex agent harnesses: runtime, orchestration, tool use, gates, stop conditions and recovery paths
• Building production LLM, RAG and agentic systems in Python and Lang Graph
• Owning evaluation end to end: error analysis, trajectory-level testing, judge calibration, live quality monitoring and release gates
• ...