Staff Software Engineer, Internal Products

Overview

Staff+ full-stack engineer to build Anthropic's internal products end to end, Claude-first, with agents and shared APIs/MCP tools that people and agents both use.

What you'll do

• Design and ship internal products end to end, from the data model to the UI, for workflows that teams across Anthropic depend on.
• Put Claude to work on real tasks, such as gathering the context a decision needs, drafting the next step of a multi-step process or keeping records consistent across the systems teams already use, and decide where an agent should act and where a well-designed UI is the better answer.
• Make agents safe to trust with real work: scoped access to data, guardrails, evals, audit trails, and clear points where a person confirms before anything happens.
• Build one set of shared capabilities that people and agents both use, exposed as APIs and MCP tools, so the same rules and approvals apply to whoever makes the call.
• Treat speed and polish as product requirements. Spend time with the people who use what you build, find where their work slows down, and remove those steps.
• Build for correctness, knowing where idempotency, reconciliation and audit trails matter for workflows that write to business-critical data.
• Integrate with the third-party systems teams already rely on, and build the layer on top of them where people and agents get their work done.
• Set technical direction for a product area over multiple quarters, lead engineers across teams through large, ambiguous projects, and make the engineers around you better through design reviews, code review and mentorship.
• Operate what you ship: own the reliability of the workflows people depend on and be on call for them.

What you'll need

• Experience shipping production software as a backend-leaning full-stack engineer, comfortable designing a data model, an API and the UI on top of them.
• Experience building software on LLMs or agents, and a point of view on when an agent should act on its own and when it should ask first.
• Experience leading the design and delivery of complex, user-facing products across the full stack, through requirements that shifted while you built.
• Experience designing for correctness and data integrity from the start, in systems where errors are costly and hard to undo.
• Experience working closely with non-engineering partners, turning ambiguous needs into clear requirements and reaching decisions together.
• Bachelor's degree or an equivalent combination of education, training, and/or experience.
• A field relevant to the role as demonstrated through coursework, training, or professional experience.

Nice to have

• Experience building internal tools or platforms that other teams rely on.
• Experience taking an agent into production for a high-stakes workflow, including the evals and guardrails that made it safe to ship.
• Experience building a zero-to-one product, or rebuilding one that people already depended on every day.
• Experience building on top of third-party platforms through their APIs, and knowing when to extend a system and when to build your own.

Details

• Locations: Remote-Friendly (Travel-Required) | San Francisco, CA | Seattle, WA | New York City, NY.
• Location-based hybrid policy: staff are expected to be in one of the offices at least 25% of the time; some roles may require more.
• Annual salary: $405,000 — $485,000 USD.
• Visa sponsorship is available for some roles and candidates.