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Senior AI Engineer - Stealth Mode
Job in
London, Greater London, W1B, England, UK
Listed on 2026-08-28
Listing for:
Oliver Bernard
Full Time
position Listed on 2026-08-28
Job specializations:
-
Software Development
AI Engineer (Applied/Software), Machine Learning/ ML Engineer, AI Reliability/ Performance Engineer
Job Description & How to Apply Below
OB are currently partnered with a stealth-mode start-up at the forefront of AI research
, and they’re looking for a Senior 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 — strong engineering fundamentals are essential (Python)
What they’re looking for:- Strong experience working with LLMs and/or foundation models
- Experience with training, fine-tuning, RL or post-training
- Background in model evaluation and optimisation
- Experience building AI agents / agentic systems
- Strong software engineering fundamentals
Position Requirements
10+ Years
work experience
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