Staff Software Engineer, Environments Infrastructure

Job summary

Responsibilities

Anthropic's Environments organization builds and maintains the infrastructure that improves Claude’s capabilities through reinforcement learning. That includes the frameworks researchers use to build environments and the infrastructure responsible for running them.

• Design widely used APIs, frameworks, and abstractions that other engineers and researchers build on, making correct usage the default and ruling out entire classes of errors…
• Own the platform layers that sit beneath every environment, including the agent runtime
• Build the tooling that lets environment owners understand, debug, and maintain their environments in production without needing an infrastructure engineer in the loop
• Embed with research teams on a rotational basis, work directly in their codebases without slowing down the research they support, and transfer ownership when you rotate off
• Anticipate silent failure modes and prevent them structurally through type safety, well-designed invariants, targeted testing, and refactors that reduce the room for correctness…

What they're looking for

• Deep expertise in Python, including static typing, safe async and concurrency patterns, and writing performant code
• Strong taste in API and framework design, the ability to explain why an interface is right or wrong rather than just recognizing it, and a track record of other engineers or…
• Experience designing or operating stateful concurrent or distributed systems, and reasoning carefully about failure, retries, idempotency, and consistency
• A habit of verification: you measure before you conclude, and you build the checks that let a system show it's correct
• Experience working productively in large, evolving, or research-style codebases that you didn't originally write

Tech stack

• Python