Staff AI RL Infrastructure Engineer

Anthropic; San Francisco (CA); Hybrid; USD 405,000 - 605,000; Full time

Benefits offered by this job

Competitive compensation

Equity donation matching (optional)

Vacation and parental leave

Flexible working hours

Office space in San Francisco

Job summary

Anthropic is seeking an engineer for the Environments org in San Francisco to design APIs and frameworks that power RL environments used by researchers. You will own platform layers beneath environments, including the agent runtime, and build tooling for production use.

You will collaborate with researchers, embed in codebases, and drive robust, verifiable systems with strong type safety and invariants. A Bachelor's degree is required and visa sponsorship is possible.

Qualifications

• Deep expertise in Python with static typing and safe async/concurrency patterns.
• Strong taste in API and framework design, with a track record of adoption.
• Experience designing or operating stateful concurrent or distributed systems.
• Habit of verification: measure before you conclude and build checks that show correctness.
• Experience in large, evolving codebases and communicating across teams.

Responsibilities

• 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 structurally.
• 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 issues
• Drive adoption of new frameworks across the organization, including deprecations and cutovers
• Help define the engineering standards, review practices, and design patterns for a new team, and mentor researchers and engineers in adopting them

Skills

Python

API design

framework design

distributed systems

static typing

verification

Education

Bachelor's degree

Job description

Anthropic is seeking an engineer for the Environments org in San Francisco to design APIs and frameworks that power RL environments used by researchers. You will own platform layers beneath environments, including the agent runtime, and build tooling for production use.

You will collaborate with researchers, embed in codebases, and drive robust, verifiable systems with strong type safety and invariants. A Bachelor's degree is required and visa sponsorship is possible.