Research Engineer, Machine Learning (RL Velocity)

Responsibilities: Build and improve the RL training infrastructure that researchers depend on day to day Identify and remove bottlenecks across the RL stack: debugging, profiling, and re‑architecting when needed Partner closely with researchers and adjacent engineering teams (inference, sandboxing, etc.) to understand pain points and ship tooling that makes them faster Own the reliability and performance of research runs end‑to‑end Contribute to design decisions that shape how Anthropic does RL at scale You may be a good fit if you Have strong software engineering fundamentals and a track record of building performant, reliable systems Have worked on ML infrastructure, distributed systems, or research tooling Care about enabling other people’s work and find leverage through platforms rather than individual experiments Are comfortable operating across the stack, from low‑level performance work to RL algorithms Have a bias toward shipping and iterating quickly, with a mix of high agency and low ego Strong candidates may also have Experience with large‑scale distributed training (RL, pre‑training, or post‑training)Familiarity with JAX, PyTorch, or similar ML frameworksA track record of operating at the edge of research and infrastructure in a fast‑moving environment$500,000 – $850,000 USDLocation and Logistics Minimum education: Bachelor’s degree or equivalent combination of education, training, and/or experience Location-based hybrid policy: Expect all staff to be in one of our offices at least 25% of the time. Some roles may require more office time.

Visa sponsorship: We sponsor visas when feasible and will make reasonable efforts to secure one for an offer recipient.

Benefits: Competitive compensation and benefits, optional equity donation matching, generous vacation and parental leave, flexible working hours, and a lovely office space to collaborate with colleagues.

Equal Employment Opportunity: As set forth in Anthropic’s Equal Employment Opportunity policy, we do not discriminate on the basis of any protected group status under any applicable law.