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Research Engineer - Agency and Reasoning

San Francisco💼 Full-time🗓 2026-03-17 → 2026-09-26

Core

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

Role type

Research Engineer (Agency and Reasoning)

Builds

Next generation of language models

Domain

Artificial Intelligence / Large Language Models

Deliverable

production ML models

Required skills

reinforcement learning, language-model-supervised fine-tuning, preference-learning methods (DPO, simPO), context-length extension, iterative fine-tuning, data engineering, synthetic data generation, PyTorch, Python

Preferred skills

rapid prototyping, strong research taste, ability to execute projects from conception to write-up

Technologies

PyTorch, Python

Responsibilities

Perform novel research in RL and post-training; apply research ideas at scale to language models; engage in data engineering and synthetic data generation; iterate on model behaviors through fine-tuning

Seniority

Mid-Senior, hands-on IC

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