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Model Performance Software Engineer, Claude Code

Anthropic· Engineering & Design - Product
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Hybrid (San Francisco, CA), Hybrid (New York City, NY)$405k - $485kFull-timePosted 8mo ago

About the role

Staff Software Engineer role at Anthropic to set technical direction at the intersection of engineering and research for Claude Code. Architect evaluation infrastructure, tooling, and production-ready systems; mentor engineers; partner with researchers to translate questions into durable engineering solutions; own critical systems end-to-end.

Responsibilities

  • Set technical direction for evaluation systems, research infrastructure, and internal tooling across the Claude Code team
  • Architect eval frameworks that measure model capabilities across diverse coding tasks and scale with our research roadmap
  • Lead the design of infrastructure that enables researchers to run experiments at scale, and make the foundational tradeoffs that shape how the team operates for years
  • Identify the highest-leverage engineering investments—often before anyone has asked for them—and drive them to completion
  • Serve as a senior technical bridge between product and research, using strong product intuition to influence which capabilities we prioritize and how we measure progress against them
  • Mentor and raise the bar for other engineers on the team; review designs, unblock peers, and model the engineering standards we want to scale
  • Partner with research leads to translate ambiguous research questions into durable engineering solutions
  • Own critical systems end-to-end, from architecture through production reliability, and take responsibility for their long-term health

Qualifications

  • Have 10+ years of software engineering experience, with a track record of operating as a Staff or Principal engineer (or equivalent) at a high-caliber organization
  • Have architected and owned complex, high-stakes systems—pipelines, infrastructure, or platforms that orchestrate many components, handle significant state and logic, and serve multiple teams
  • Have a history of setting technical direction that others follow—through design docs, architectural decisions, or technical strategy that shaped how a team or org operates
  • Thrive in high-intensity environments with fast iteration cycles, and have the judgment to know when to move fast and when to invest in durability
  • Take full ownership of ambiguous, open-ended problems and drive them to completion with minimal direction
  • Are a power user of agentic coding tools with deep intuition about model capabilities and limitations
  • Can dive into unfamiliar technical domains—ML systems, research workflows, novel infrastructure—and get to the frontier quickly
  • Care deeply about correctness and reliability, and have raised engineering standards on teams you've been part of
  • Are energized by working at the boundary between engineering and AI research, and by the prospect of influencing both

Skills

Required:Software engineeringSystem architectureTechnical leadership
Nice to have:PythonTypeScript

Benefits

  • competitive compensation and benefits, optional equity donation matching, generous vacation and parental leave, flexible working hours, and a lovely office space
Last updated Sep 16, 2026. Interested? Apply on the company site.

About Anthropic

building reliable, interpretable, and steerable AI systems

Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

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