Staff AI Engineer - London - Up to £200k

🚀 Staff AI Engineer | Stealth Mode AI Start-up | London | Up to £200k

Oliver Bernard have partnered with a stealth-mode start-up in the AI \& Research space , who are looking for a Staff AI Engineer to join the team and work on some genuinely challenging problems across LLMs, reinforcement learning and agentic systems.

This is a hands-on research + engineering role, where you’ll be involved in:

🧠 LLM training \& fine-tuning

• including reinforcement learning and post-training

🔄 Evaluation \& feedback loops

• building systems to continuously assess and optimise models

🤖 Agent development

• designing and building sophisticated AI agents

🔬 AI research

• exploring LLM training, RL, evaluation and optimisation techniques

💻 Software engineering

• applying strong engineering fundamentals to complex AI problems

What they’re looking for

• Strong experience working with

LLMs and/or foundation models

• Deep experience with

training, fine-tuning, RL or post-training

• Strong background in

model evaluation and optimisation

• Experience building

AI agents / agentic systems

• Excellent software engineering fundamentals
• A strong track record in

AI research

and solving technically complex problems

📍 London – 2 days hybrid

💰 Up to £200k

If you’re a Staff-level AI Engineer who wants to work at the intersection of cutting-edge research and production engineering, apply below for more information.

Stealth | Staff AI Engineer | London