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