Research Engineer, Model Evaluations

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

We're looking for Research Engineers to build the evaluations that tell us — and the world — what Claude can actually do. Your work will turn ambiguous notions of "intelligence" into clear, defensible metrics that researchers, leadership, and the public can rely on.

You'll design and implement evaluations across the full spectrum of Claude's capabilities and personality, and build the infrastructure that runs them reliably at scale. You'll partner closely with researchers throughout the lifecycle of a new capability — from defining what to measure, to running the eval against live training checkpoints, to interpreting the results. The goal is to make Anthropic the leader in extremely well-characterized AI systems, with performance that is exhaustively measured and validated across the tasks that matter.

Key responsibilities

Design and run new evaluations of Claude's capabilities — reasoning, agentic behavior, knowledge, safety properties — and produce visualizations that make the results legible to researchers and decision-makers

Build and harden the distributed eval execution platform so hundreds of evals run reliably against checkpoints throughout production RL training runs

Own the dashboards researchers and leadership use to monitor model health during training, improving signal-to-noise, reducing latency, and making regressions impossible to miss

Debug anomalous eval results mid-training-run, determine whether the cause is a model change or an infrastructure issue, and communicate the answer clearly under time pressure

Improve the tooling, libraries, and workflows researchers use to implement and iterate on evaluations

Partner with research teams across the full lifecycle of a new capability — from defining what to measure to interpreting results as training progresses

Run experiments to characterize how prompting, sampling, and scaffolding choices affect results on internal and industry benchmarks

Communicate evaluations and their results to internal stakeholders and, where appropriate, external audiences

Minimum qualifications

Strong Python programming skills, including production or research infrastructure

Experience building or operating distributed systems, data pipelines, or other infrastructure that needs to be reliable at scale

Clear written and verbal communication, especially when explaining technical results to non-specialists

Comfort operating in an on-call or production-support capacity when training runs are live

Care about the societal impacts of your work and an interest in steering powerful AI to be safe and beneficial

Preferred qualifications

Hands-on experience using large language models such as Claude, including prompting, sampling, and scaffolding

Background in data visualization and a track record of building dashboards people actually trust and use

Experience developing robust evaluation metrics for language models