MTS — Research Scientist (AI)

MTS — Research Scientist (AI) Overview Physical Superintelligence is a startup with roots at Harvard, MIT, Johns Hopkins, Oxford, the Institute for Advanced Study, and the Perimeter Institute is building AI systems to discover new physics at scale. We are seeking AI researchers to develop reinforcement learning agents and training systems for scientific discovery. Role and Responsibilities Build and train AI systems for physics discovery, working with physicists who design verification harnesses and engineers who build training infrastructure. Focus on core AI research questions including how agents learn physics reasoning, action space design for scientific discovery, reward structure development, and training systems that scale. Build and train reinforcement learning agents using modern approaches including PPO, SAC, MuZero, and multi-agent self-play and other methods Design agent architectures for physics reasoning and scientific tool use Implement training curricula and reward structures for discovery tasks Develop evaluation workflows and benchmarks for physics reasoning capabilities Build instrumentation to understand agent behavior and learning dynamics Collaborate with physicists and engineers on system design and architecture What We're Looking For We seek candidates with experience building agents and training models with reinforcement learning. You should have proficiency in modern machine learning frameworks and understand distributed training systems with a track record shipping working AI systems. Core AI and machine learning skills: Hands-on experience with modern reinforcement learning algorithms including PPO, SAC, MuZero, and multi-agent self-play and other methods Proficiency with PyTorch or JAX, distributed training using Ray, XLA, or Accelerate, and modern pretraining workflows Valued backgrounds and experience: Physics or mathematics background providing intuition for physical reasoning and mathematical modeling Experience applying agents to simulators, games, scientific tool use, or benchmark design with rigorous experimental methodology Location and Compensation This is an in-person role based in Boston or San Francisco. We offer competitive compensation including salary, benefits, and meaningful early-stage equity. We evaluate on AI research depth, scientific curiosity, and ability to ship working systems. We are an equal opportunity employer and value diverse perspectives in building AI for scientific discovery. Apply tot his job