Zyphra is an artificial intelligence company based in San Francisco, California. The Role: As a Research Engineer - Agency and Reasoning, you will be a core contributor to Zyphra’s Agency and Reasoning Team. You will be involved with performing novel research in reinforcement learning, post-training, and human preference learning, and applying your ideas at scale to our next generation of language models. What We’re Looking For / Requirements: • Strong research taste and intuition • The ability to work through a research project from conception to execution to write-up • Strong implementation and prototyping skillset • A researcher who can take an idea from conception to experimentation extremely quickly • The ability to work well and cooperate with others in a high-paced research setting • Curiosity, interest, and joy in understanding intelligence. Qualifications / Additional Skills: • Experience and aptitude with reinforcement learning, either in the context of language model reasoning or more classical RL tasks • Experience with language-model-supervised fine-tuning and preference-learning methods, such as DPO and simPO. • Experience with context-length extension methods • A good intuitive ability to understand model behaviors and correct them through iterative fine-tuning • Interest in grappling in detail with data and spending significant time involved in data engineering and synthetic data generation • Postgraduate degree in a scientific subject (Computer Science, EE/EECS, Mathematics, Physics) • Previously published machine learning research in well-respected venues • Highly proficient with PyTorch and Python • We are excited and able to rapidly learn new fields and implement new ideas • Excellent communication and collaboration skills, and can work effectively on both research and engineering implementation at scale Why Work at Zyphra: • Our research methodology is to make grounded, methodical steps toward ambitious goals. Both deep research and engineering excellence are equally valued • We strongly value new and crazy ideas and are very willing to bet big on new ideas • We move as quickly as we can; we aim to minimize the bar to impact as low as possible • We all enjoy what we do and love discussing AI Benefits and Perks: • Comprehensive medical, dental, vision, and FSA plans • Competitive compensation and 401(k) plan • Relocation and immigration support on a case-by-case basis • In-office snacks and meals provided • Unlimited PTO and company holidays • In-person team in San Francisco with a collaborative, high-energy environment