Model Performance Software Engineer, Claude Code

Job summary

Responsibilities

We're looking for a Staff Software Engineer to set technical direction at the intersection of engineering and research on the Claude Code team. In this role, you'll partner directly with Anthropic's researchers and engineering leadership to shape how we measure, understand, and improve Claude's…

• 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…

What they're looking for

• Designing or scaling eval/evaluation frameworks for ML systems
• Reinforcement learning infrastructure or training systems
• Leading technical initiatives in high-performance, demanding environments—trading firms, quant funds, frontier research labs, or fast-moving startups where intensity and…
• Research computing, scientific infrastructure, or developer platforms at scale
• A strong quantitative foundation (math, physics, or related fields)

Tech stack

• Python
• TypeScript