Senior Frontend Engineer

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About this role

Senior Frontend Engineer San Francisco, California, United States ⚠️ Please read first - This is a full-time, in-person role based in San Francisco (Presidio) - we work from the office 5 days a week . - You must be based in the Bay Area or willing to relocate before starting . - We require US work authorisation , but are open to O-1 or J-1 visa sponsorship for exceptional candidates. What You'll Do You'll own the frontend of Sauna - shipping interfaces that feel instant, intuitive, and polished even when the underlying work is complex. You'll need to make product and design calls yourself, prototype quickly, and execute without waiting for perfect specs. Sometimes you'll implement designs. Other times you'll create them. Stack TypeScript, React, Tanstack, Zustand, TailwindCSS, IndexedDB, Cloudflare Workers. Who You Are Minimum - 4+ years of frontend engineering with a portfolio of complex web apps you've shipped - we want to see multiplayer experiences, apps handling large data with sophisticated fetching and caching, or work with server-sent events (SSE). - You love React and deeply understand state management. You know when to useMemo , how callbacks work, the component lifecycle, and you write beautiful, reusable components. You recognise when props are being drilled through multiple layers and should be lifted into context or Zustand instead. - You're comfortable owning a feature full-stack. You can do the DB migration, write the route in the backend, fetch on the frontend, and create the UI for it. - Product sense

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