Research Engineer, RL Scaling Science

About Anthropic

Anthropic’s mission is to create reliable, interpretable, and steerable AI systems. We want AI to be safe and beneficial for our users and for society as a whole. Our team is a quickly growing group of committed researchers, engineers, policy experts, and business leaders working together to build beneficial AI systems.

About the role

Anthropic's RL Scaling Science team studies how reinforcement learning behaves as we scale it (across model size, compute, and task horizon) and turns that understanding into the training recipes behind our frontier models. As a Research Engineer on this team, you'll design and run large-scale experiments to understand and resolve bottlenecks, build the benchmarks that make long-horizon progress measurable, and ship validated findings directly into production training.

This role lives at the boundary between research and engineering. The problems are open, the experiments run at frontier scale, and the path from a robust result to production is short.

Key responsibilities

Design, run, and interpret large-scale RL experiments, reasoning rigorously about what the data does and doesn't show

Investigate how RL improves as horizon, compute, and model size grow

Build and maintain benchmarks for long-horizon RL so progress is measurable and reproducible

Translate validated findings into production training recipes, exercising judgment about when a result is robust enough to ship

Debug complex issues at the seam where research meets infrastructure - failures that only appear at scale

Partner closely with adjacent RL teams across research and engineering and advance our overall RL stack

Minimum qualifications

Strong empirical research skills in Reinforcement Learning, large-scale ML training, or a closely adjacent area

Demonstrated ability to own large experiments end-to-end, from design through interpretation

Proficiency in Python and experience working with large-scale or distributed ML systems

Comfort operating at the research/systems boundary, including debugging where the two meet

Care about the societal impacts of AI and responsible scaling

Preferred qualifications

Published or shipped work in long-horizon RL or RL fundamentals

Experience translating research findings into production training recipes

Demonstrated large scale industry impact via RL interventions 

Experience working on frontier-scale training runs with long trajectories

Representative projects

Design a benchmark suite for long-horizon RL that distinguishes genuine capability gains from artifacts of evaluation setup

Take a promising experimental finding, stress-test it across model scales, and work with training teams to land it in a production recipe

Investigate an unexpected scaling trend in an RL run and trace it to a root cause spanning algorithm, data, and infrastructure

The annual compensation range for this role is listed below. 

For sales roles, the range provided is the role’s On Target Earnings ("OTE") range, meaning that the range includes both the sales commissions/sales bonuses target and annual base salary for the role.

Annual Salary: £375,000 — £640,000 GBP

Logistics

Minimum education: Bachelor’s degree or an equivalent combination of education, training, and/or experience

Required field of study:  A field relevant to the role as demonstrated through coursework, training, or professional experience

Minimum years of experience: Years of experience required will correlate with the internal job level requirements for the position

Location-based hybrid policy: Currently, we expect all staff to be in one of our offices at least 25% of the time. However, some roles may require more time in our offices.

Visa sponsorship:  We do sponsor visas! However, we aren't able to successfully sponsor visas for every role and every candidate. But if we make you an offer, we will make every reasonable effort to get you a visa, and we retain an imm …