Research Engineer (Reinforcement Learning)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Research Engineer (Reinforcement Learning) based in United Kingdom. Join a small, senior engineering team building the next generation of voice- and text-driven AI agents.You’ll focus on post-training models to make agents more capable, reliable, and effective over long-running interactions.Your work will span environments, verifiers, synthetic data, training experiments, evaluations, and production deployment.You’ll tackle challenging problems such as persistent context, reliable tool use, and multi-turn agent behavior.The role combines hands-on research and engineering, with a strong emphasis on measurable improvements in model performance.You’ll work closely with experienced engineers in a remote, collaborative environment where technical craft and creativity are highly valued.Your contributions will directly shape AI systems operating at significant production scale.