Research Engineer (LLM Performance), London is open at Isomorphic Labs in London. Posted on Sep 8, 2026, and still on Isomorphic Labs’s careers page when we last checked, on Nov 14, 2026.
About the role
Implement and optimize LLM post-training methods at scale on frontier models. Collaborate with research teams to translate new methods into production-ready systems. Relentlessly prioritize and execute on performance optimization opportunities. Evaluate and deploy frameworks for supervised fine-tuning, reinforcement learning and LLM evaluation. Diagnose and fix performance bottlenecks and communication overhead in…
The opening lines of the posting. The rest is on Isomorphic Labs’s careers page.
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