Drimva

Zyphra

Research Engineer - Agency and Reasoning

San Francisco · On-site · Full-time · Posted Mar 17, 2026

Education
Postgraduate degree in a scientific subject (Computer Science, EE/EECS, Mathematics, Physics)
Visa sponsorship
Relocation and immigration support on a case-by-case basis.

About the job

Conduct research in reinforcement learning, post-training, and human preference learning, and apply the results at scale to next-generation language models.

What you'll do

  • Take research projects from conception through experimentation and write-up.
  • Rapidly implement and prototype ideas, applying them to language models at scale.
  • Work collaboratively in a fast-paced research and engineering environment.

What they ask for

  • Strong research judgment and ability to carry projects from conception to execution and write-up.
  • Strong implementation and prototyping skills.
  • Experience or aptitude with reinforcement learning.
  • High proficiency with PyTorch and Python.

Nice to have

  • Experience with language-model fine-tuning and preference-learning methods such as DPO and simPO, or context-length extension methods.
  • Postgraduate degree in a scientific subject or published machine-learning research in respected venues.

Tools

PyTorch, Python, DPO, simPO

AI focus

Research and develop reinforcement learning, post-training, and human preference-learning methods for next-generation language models.

Model-written summary · the original posting is authoritative

First seen Oct 10, 2026 · Last verified Nov 5, 2026 (UTC)