About Grafton Sciences We’re building physical general intelligence — autonomous systems that can experiment, reason, and discover in the physical world. With deep technical roots and real-world progress at scale (e.g., a $42M NIH project), we’re pushing the frontier of physical AI. Joining us means inventing from first principles, owning real systems end-to-end, and helping build a capability the world has never had before.

About The Role We’re seeking a Senior RL Research Scientist to design and train reinforcement learning systems that optimize tool control, process tuning, and long-horizon workflows. You’ll build RL environments grounded in real physics, simulation, and digital twins; integrate dense verifiers; design safe RL strategies; and drive the transition from offline data to robust online behavior. This role spans algorithm development, systems integration, and hands-on experimentation in complex, high-dimensional domains.

Responsibilities

• Build RL environments for optimization, process tuning, and tool orchestration using real-world simulation and digital twins.
• Design and implement safe RL methods, verifier-integrated rewards, offline→online transitions, and policy evaluation pipelines.
• Develop state representations, action abstractions, and constraint mechanisms for reliable long-horizon decision-making.
• Collaborate with LLM researchers, agent systems, simulation teams, and tooling engineers to deploy RL agents into real workflows.

Qualifications

• Strong background in reinforcement learning, optimal control, or sequential decision-making, with experience applying RL to complex real or simulated systems.
• Familiarity with safe RL, constrained RL, verifier/detector integration, or multi-step policy evaluation frameworks.
• Demonstrated ability to build RL environments, design reward structures, and diagnose policy behavior at scale.
• Comfortable working across ML, simulation, systems engineering, and physical-toolchain interfaces in a fast-paced research environment.

Above all, we look for candidates who can demonstrate world-class excellence. Compensation We offer competitive salary, meaningful equity, and benefits.