Senior AI Engineer - AI Platform - £150k + Equity

Working closely with leading AI labs, the team is developing the systems, data and tooling required to train and evaluate increasingly capable AI agents., * Own challenging AI and research-engineering problems from the initial idea through experimentation, implementation and production.

• Develop approaches for creating, curating and improving high-quality training data for advanced models and AI agents.
• Develop AI agent harnesses, sandboxed environments and systems that connect models to interactive software tasks.
• Prototype rapidly, establish what works through experimentation, then turn successful approaches into robust, observable production systems.
• Take ownership of substantial technical projects over months, rather than working solely on isolated experiments or features.

• Hands-on experience fine-tuning or post-training models, rather than solely working with model APIs.
• Strong foundations across modern AI/ML, including model training, optimisation and evaluation.
• Practical experience with SFT, reinforcement learning, RLHF or related post-training techniques.
• Strong Python skills and the software engineering depth to build clean, testable and reliable systems.
• Experience owning meaningful technical outcomes and making trade-offs across research, data and engineering.