Senior / Principal AI Engineer (x2) - London (Hybrid) - Python, LangGraph, TypeScript, 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 LangGraph
Owning evaluation end to end: error analysis, trajectory-level testing, judge calibration, live quality monitoring and release gates
Building secure integrations with business-critical systems, with human approval before consequential actions
Developing sandboxed code execution and long-running, resumable background agent tasks
Connecting cost, outputs and user feedback so customers can see the real value of their AI usage
Partnering with the CTO on architecture, reviews, mentoring and engineering standards
Benefits
Salary of £90,000 - £150,000 depending on experience, plus equity
Join an early-stage company with major investor backing and the ambition to lead its market
Direct access to an experienced CTO and real influence on technical direction
Hybrid working: 3-4 days a week in a beautiful central London office
Work on hard, meaningful problems rather than thin model integrations
Key experience
Strong, hands-on experience building complex agent harnesses and evaluations (essential)
Production experience with LLMs, RAG systems and AI agents
Proficiency in Python and LangGraph, with solid engineering fundamentals (TypeScript, PostgreSQL, APIs, queues, cloud; GCP a plus)
Experience evaluating agent trajectories, ...
Senior / Principal AI Engineer employer: Tenth Revolution Group Careers
Join a forward-thinking organisation in South London that prioritises employee development and innovation. With a strong focus on hybrid working, you will benefit from a collaborative work culture that encourages continuous learning and professional growth. Enjoy competitive remuneration and the opportunity to make a significant impact on business transformation initiatives while working alongside dedicated professionals in a supportive environment.
Contact Details:
Tenth Revolution Group Careers Recruitment Team
