Product ML Engineer: Open-Model AI Post-Training

PhysicsX Ltd. in London is seeking a hands-on product ML engineer to own the capability that lets customers improve LLMs for their work.

You will work closely with Research and Platform teams to turn post-training methods into deployable features, with a focus on open models performing well on our evaluation benchmarks. The role covers SFT, RLHF/RLAIF, distillation, synthetic data, and verifiers, with responsibility for data governance, reproducibility and safe handling of customer artifacts.