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Research Engineer - Posttraining

Periodic Labs

Salary not specified
Oct 17, 2025
Menlo Park, CA, USA
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Periodic Labs is looking to post-train frontier models to autonomously run various parts of the scientific discovery pipeline, aiming to make novel scientific discoveries.

Requirements

  • Creating and scaling RL environments for LLMs
  • Creating high-quality evals for frontier models
  • Working closely with domain experts to define evaluation criteria, tools, and environments for agents
  • Carefully crafting training datasets and reward functions, with LLMs and/or human trainers
  • Training frontier LLMs with RL

Responsibilities

  • post-train frontier models to autonomously run various parts of the scientific discovery pipeline
  • Models you train will generate hypotheses, design experiments that run in an actual lab, operate sophisticated scientific equipment, and more
  • work with the world’s leading experts in the physical sciences in order to create high-quality evaluation and training tasks
  • scale up RL environments
  • design creative reward functions
  • run large-scale RL runs
  • automating scientific discovery

Other

  • Team members are owners who identify and solve problems without boundaries or bureaucracy.
  • We eagerly learn new tools and new science to push forward our mission.