Model Quality Software Engineer, Claude Code

Model Quality Software Engineer, Claude Code 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.

San Francisco, CA or New York, NY

We’re looking for a Software Engineer to work at the intersection of engineering and research on the Claude Code team. In this role, you’ll collaborate directly with Anthropic’s researchers to improve Claude’s coding capabilities through tooling, infrastructure, and evaluations. You’ll build systems that help us understand where Claude Code excels and where it falls short—and then help close those gaps.

We’re looking for engineers who can build robust, complex systems and who thrive in fast‑paced, high‑intensity environments. You’ll take ambiguous problems and turn them into reliable infrastructure that accelerates our research.

• Design and build eval systems that measure model capabilities across diverse coding tasks.
• Build tooling and infrastructure that enables researchers to run experiments at scale.
• Develop pipelines for data collection, processing, and analysis.
• Create internal tools that improve researcher productivity and accelerate iteration cycles.
• Serve as a bridge between product and research—bring strong product intuition to inform which capabilities matter most.
• Work closely with researchers to translate research questions into engineering solutions.
• Own systems end‑to‑end—from design through production reliability.

• Have built and owned complex systems—pipelines, infrastructure, or software that orchestrates many components and handles significant state and logic.
• Thrive in high‑intensity environments with fast iteration cycles.
• Take full ownership of problems and drive them to completion independently.
• Are a power user of agentic coding tools and have strong intuition about model capabilities and limitations.
• Are comfortable diving into unfamiliar technical domains and figuring things out quickly.
• Care deeply about correctness and reliability in the systems you build.
• Are excited to work at the boundary between engineering and AI research.
• Have at least 5 years of work experience.

• Writing or maintaining eval frameworks.
• Working in high‑performance, demanding environments—trading firms, quant funds, competitive research labs, or fast‑moving startups where intensity is the norm.
• Research computing or scientific infrastructure background.
• A strong quantitative foundation (math, physics, or related fields).
• Python and Type Script.

$320,000 - $485,000 USD

Education requirements: We require at least a Bachelor’s degree in a related field or equivalent experience.

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 immigration lawyer to help with this.

We encourage you to apply even if you do not believe you meet every single qualification. Not all strong candidates listed. Research shows that people who identify as being from underrepresented groups are more prone to experiencing imposter syndrome and doubting the strength of their candidacy, so we urge you not to exclude yourself prematurely and to submit an application if you’re interested in this work.

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