Research Scientist / Engineer – Reinforcement Learning Infrastructure

Company

Luma

Where

London, UK

Level

Staff

First seen

October 21, 2026

Listed via

Ashby

What the posting says

You'll build the systems that make reinforcement learning work at frontier scale — coupling policy optimization with large fleets of inference workers, agentic environments, and the reward and verification systems that turn model behavior into learning signal. RL is how Luma's models go from capable to useful. RL at scale is a full-loop systems problem: training, rollout generation, environment execution, and reward computation running concurrently across thousands of GPUs, all needing to stay fast, stable, and correct together. It fits someone who has lived this — post-trained LLMs with RL,…

Read more and apply on Luma's site

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