just wrapped my frontend engineering loop at Anthropic. it's a small-ish team relative to the total headcount so the role was somewhat specialized, but I'll share what I can.
context: I'm a mid-senior frontend eng, ~5 YOE, React-heavy. I was targeting a role on their Claude.ai product side.
the loop:
recruiter call: nothing unusual. they confirmed I knew TypeScript and React, asked about my familiarity with design systems and accessibility.
technical phone screen: they gave me a component design problem. build a message thread UI that handles streaming text (important context: Claude responses stream in token by token). I had to think through state management for streaming, how to handle partial markdown rendering, and error states. this is genuinely their product problem so it felt relevant.
onsite, 4 rounds: frontend coding: build a small interactive feature from scratch. they care about clean component boundaries, prop handling, and keyboard accessibility. they asked about semantic HTML during the review. points if you mention aria attributes unprompted. system design, frontend-flavored: design the real-time update mechanism for a collaborative document editor. we talked about websockets vs. SSE, optimistic updates, conflict resolution. they didn't need me to spec out CRDT algorithms but they wanted to know I'd heard of the problem. behavioral: strong emphasis on cross-functional collaboration. how have you worked with designers, PMs, backend teams? they also asked how I'd push back on a product decision I thought was harmful. not a gotcha but they're looking for people who can advocate for users. mission round: same as what others have said. why Anthropic, why now. I talked about building interfaces that make AI legible and less opaque to users. seemed to resonate.
the technical bar felt slightly lower than what I've heard for backend SWE, but the product and craft sense check is real. they want engineers who care about what it's like to use the thing, not just whether it ships.
still waiting on the decision. should know this week.