Research Engineer at Metis, Inc. (San Francisco, CA)Research Engineer

As a Research Engineer at Metis, you’ll work on building the next generation of autonomous post-training systems that leverage our Mantis platform. You’ll operate at the intersection of cutting-edge ML research and scalable engineering, designing, implementing, and deploying algorithms that improve how AI agents learn from feedback, synthetic data, and real-world interactions.

You’ll move seamlessly between papers and production, leading large-scale experiments, creating optimized training pipelines, and helping shape the future of post-training autonomy. You’ll have significant ownership, high compute budgets, and the mandate to push the state of the art in applied reinforcement and preference optimization.

• Research and help build an autonomous post-training agent leveraging the Mantis platform
• Design and execute large-scale experiments on synthetic data generation and algorithmic architecture
• Develop and refine methods for reinforcement learning, reward modeling, and human feedback integration
• Collaborate cross-functionally with Core and Platform Engineering to deploy and evaluate models in production settings
• Publish or contribute to leading-edge research in the post-training domain
• Use tooling and compute efficiently to iterate on experimental pipelines and accelerate research velocity

• Deep experience in machine learning, preferably reinforcement learning, post-training, or alignment research
• Demonstrated research contributions; ideally published papers (ICML, NeurIPS) or public implementations
• Strong proficiency in Python and ML frameworks (PyTorch, JAX, or TensorFlow)
• Comfort with distributed training, high-throughput data pipelines, and large-scale experiment management
• Ability to reason independently, formulate hypotheses, and run experiments from idea → insight → product impact

• Base: $200,000–$1,000,000
• Significant Equity
• Full medical, dental, and vision
• Wellness & L&D stipend
• Equinox membership
• Breakfast, lunch, and dinner provided (Unlimited Doordash)
• $25,000 housing stipend

Metis helps enterprises and labs build the most reliable AI agents by leveraging post-training. Our platform enables the creation, improvement, and deployment of the most capable frontier agents designed for rigorous, real-world workflows.

Momentum

• 0 → six-figure monthly revenue in the last six weeks
• Working with several Fortune 500 enterprises & frontier AI labs
• Growing 150%+ MoM

Backed by

Y Combinator, CRV, and executives from OpenAI, Google, Mercor, NVIDIA, and others.