Staff Software Engineer, Code RL

Highlights

• Drive RL behind Claude's coding skills via agentic coding environments.
• Design base RL environment abstractions used across many environments.
• Build probes and tooling to catch sandbox regressions and RL issues early.

What they offer

• Competitive compensation and benefits
• Optional equity donation matching
• Generous vacation and parental leave
• Flexible working hours
• Lovely office space for collaboration

Ideal candidate

A systems-minded engineer with taste for clean APIs who loves making complex research systems reliable. You thrive in ambiguity, embedding with teams and leaving behind maintainable standards.

Requirements

• Deep expertise in Python, including static typing, safe async and concurrency patterns, and writing performant code
• Track record of designing intuitive, safe APIs or frameworks that other engineers or teams adopted
• Experience working productively in large, evolving, or research-style codebases you didn't originally write
• Ability to anticipate failure modes — especially silent ones — and prevent them structurally
• Strong written and verbal communication skills, including explaining system designs to varied backgrounds
• Comfort with ambiguity: able to scope own work from loosely defined problem to maintainable outcome