Senior React Developer
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We are looking for a Frontend Developer for an early-stage AI startup building a product - a personal AI assistant designed for knowledge workers. Our system understands user context, prioritizes work, operates in the background, and delivers supervision-ready output instead of waiting for prompts. We are a small, high-agency team building a product that demands craft, speed, and ownership. This is a foundational hire. You will own the entire frontend and shape the user experience of a complex AI-driven application. You will ship polished, intuitive, and high-performance interfaces. This is not a role where you wait for pixel-perfect designs. You will make product and design decisions independently, prototype quickly, and execute without perfect specs. Craft matters. Loading states, empty states, keyboard shortcuts, performance optimizations, and UX details are expected to feel deliberate and refined.
Location: San Francisco, CA (On-site)
Employment: Full-time
Level:
SeniorStart: ASAPMust be US-based or willing to relocate before startingUS work authorization or O-1 eligibility required Tech StackTypeScript, React, TanStack, Zustand, TailwindCSS, IndexedDB, Cloudflare Workers.
What You’ll Do:
- Own frontend architecture and feature development end-to-end
- Build complex, production-grade React applications
- Make product and interaction design decisions when needed
- Rapidly prototype and iterate based on feedback
- Ensure performance, scalability, and maintainability
- Occasionally handle lightweight backend tasks when required
- Establish frontend standards and best practices
What We’re Looking For:
- 4+ years of frontend engineering experience
- Deep expertise in React and TypeScriptStrong understanding of state management and performance optimization
- Portfolio of complex web applications used in production
- Ability to own features end-to-end (from backend adjustments to UI/UX)
- Strong product sense and design intuition
- High autonomy, ownership mindset, low ego
- Comfortable operating without detailed specifications
Without a strong portfolio and clear product-oriented thinking, the process will not move forward.
Nice to Have:
- Experience with multiplayer apps (CRDTs, Y.js, Automerge)
- Experience building LLM-based interfaces (streaming responses, progressive disclosure)
- Local-first architectures (IndexedDB, service workers)
- Design background or strong visual sense
- Experience as a founding frontend engineer
Interview Process:
- Application (resume + short questions)1-minute Loom introduction15-minute intro call
- System design interview
- Final conversation
- Paid in-person work trial
Benefits:
- Meaningful early-stage equity
- Health and dental coverage 401(k)
- Generous PTOGym budget and daily lunch