Senior AI Research Engineer: LLMs, RL & Agents

Oliver Bernard; Greater London; On-site; GBP 120,000 - 150,000; Full time

Job summary

Oliver Bernard partners with a stealth-mode AI start-up in London, seeking a Senior AI Engineer. You’ll join a team working on cutting-edge research across LLMs, reinforcement learning and agentic systems, blending rigorous research with strong software engineering.

The role focuses on building AI agents, developing feedback loops, and conducting AI research, applying expertise in LLM training, RL, post-training or evaluation to tackle ambitious problems.

Qualifications

• Strong software engineering fundamentals required.
• Experience in LLM training, RL, post-training or evaluation.
• Research experience in AI preferred.

Responsibilities

• Building AI agents
• Developing feedback loops
• AI research

Skills

Software engineering fundamentals

LLM training

Reinforcement learning

AI research

Building AI agents

Feedback loops

Job description

Oliver Bernard partners with a stealth-mode AI start-up in London, seeking a Senior AI Engineer. You’ll join a team working on cutting-edge research across LLMs, reinforcement learning and agentic systems, blending rigorous research with strong software engineering.

The role focuses on building AI agents, developing feedback loops, and conducting AI research, applying expertise in LLM training, RL, post-training or evaluation to tackle ambitious problems.