Senior Frontend Developer

Own the frontend of our core product - shipping interfaces that feel instant, intuitive, and polished even when the underlying work is complex. This isn't a role where you wait for designs to land in your queue: you'll make product and design calls yourself, prototype quickly, and execute without perfect specs. Sometimes you'll implement designs; other times you'll create them.

The expectation is craft - not just working code, but software that feels good: loading states, empty states, error messages, keyboard shortcuts, and the thousand small decisions that separate a polished product from a functional one.

About the Company

We're a 12-14 person AI-native team building a personal AI assistant for knowledge workers - something closer to "Cursor for knowledge work" than a chatbot. The system understands user context, curates and prioritises work, operates in the background, and delivers supervision-ready output rather than waiting to be prompted. We've raised $30M in seed funding from Spark Capital, Felicis, and Y Combinator - one of the largest seed rounds in YC history. The team is composed of former founders, CTOs, and high-agency builders, where high ownership is the norm, not the exception.

What You'll Bring

• 4+ years of frontend engineering experience

• A portfolio of complex web apps you've shipped - production systems real users depend on, not side projects

• Deep React fluency: you understand state management, when to memoize, how callbacks work, and the component lifecycle, and you write clean, reusable components. You spot prop drilling before it becomes a problem and know when to lift into context or a dedicated state store

• Full-stack comfort: owning a feature end to end - DB migration, backend route, frontend fetch, and UI - without a separate engineer for each layer

• Performance instinct: you know when to cache, when to refetch stale data, and how to optimistically update the UI, and you notice duplicated network requests

• Product sense and design intuition: take a rough product direction, sketch an interaction, and ship something that feels right without waiting for a finished spec

• High autonomy, low ego: you ship, gather feedback, and iterate, and you unblock yourself

• US work authorisation or O-1 eligibility, and based in the Bay Area or willing to relocate before starting (European candidates may be considered for O-1 visa sponsorship)

Bonus Points

• Experience with multiplayer apps (Y.js, Automerge, CRDTs)

• Building interfaces for LLM-based tools - streaming responses, handling uncertainty, progressive disclosure

• Local-first architectures (service workers, sync strategies)

• A design background or strong visual sense

• Previously a founding frontend engineer who established standards from scratch

Interview Process

1. Application - resume and a few short questions. Exceptional candidates go from first touch to offer within two weeks.

2. 1-minute Loom - tell us who you are and why this role.

3. 15-minute intro call - align on location, motivation, and logistics.

4. System design interview - a deep dive into how you think and architect systems, walking through a real product problem together.

5. Final conversation - your questions answered and the work trial scoped.

6. Paid work trial - in person, a few days to two weeks, working on a real project to see how we work together.

What's on Offer

• Meaningful early-stage equity

• Comprehensive health and dental coverage

• 401(k)

• Considerable PTO

• Gym budget and daily lunch