Senior AI Engineer - Stealth Mode Start-up - up to £150k - London

🚀 Senior AI Engineer | Stealth Mode AI Start-up 📍London 💷 Up to £150kOB 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 modelsExperience with training, fine-tuning, RL or post-trainingBackground in model evaluation and optimisationExperience building AI agents / agentic systemsStrong software engineering fundamentals📍 London – 2 days hybrid💰 Up to £150kInterested? Apply below for more details Stealth | London | Senior AI Engineer