Senior Frontend Developer
W3 Global Sourcing•San Francisco, CA
•Onsite
About The Position
We are representing a fast-moving, early-stage technology company building a sophisticated product with complex workflows and a strong emphasis on user experience. The company is looking for a frontend engineer who can bring product judgment, design sensitivity, and technical depth to a highly iterative environment. This is an opportunity to join a lean team where the frontend experience is central to the product's success. The ideal candidate will care deeply about speed, polish, usability, and the small details that make software feel excellent.
Requirements
- 4+ years of frontend engineering experience.
- Strong experience shipping complex production web applications used by real users.
- Deep React fluency, including state management, component lifecycle, callbacks, memoization, reusable components, context, and modern frontend architecture.
- Strong TypeScript experience.
- Comfort working with modern frontend tools and frameworks such as React, TanStack, Zustand, TailwindCSS, IndexedDB, and related technologies.
- Strong product and design intuition, with the ability to create excellent user experiences from incomplete or ambiguous requirements.
- A strong performance mindset and the ability to build fast, responsive interfaces.
- Full-stack comfort and willingness to own features across the frontend, backend, data layer, and UI.
- High autonomy, strong execution speed, and the ability to unblock yourself in a fast-moving environment.
- Low ego, strong collaboration skills, and a bias toward shipping, gathering feedback, and iterating.
- US work authorization is required.
Nice To Haves
- Experience building multiplayer or collaborative applications.
- Familiarity with technologies such as Y.js, Automerge, CRDTs, or similar collaboration frameworks.
- Experience building interfaces for AI or LLM-based tools, including streaming responses, uncertainty handling, and progressive disclosure.
- Experience with local-first architectures, including IndexedDB, service workers, sync strategies, or offline-capable applications.
- Strong visual design sense or a prior design background.
- Experience as an early or founding frontend engineer, especially in setting frontend standards from scratch.
- Exposure to serverless or edge environments such as Cloudflare Workers.
- Exceptional international candidates with O-1 eligibility may be considered.
Responsibilities
- Own the development of polished, high-performance frontend experiences for a complex web application.
- Build responsive, intuitive interfaces using modern frontend technologies.
- Translate rough product direction into thoughtful user flows, interaction patterns, and production-ready UI.
- Partner closely with product, design, and engineering to shape features from concept through launch.
- Care deeply about loading states, empty states, error handling, keyboard shortcuts, responsiveness, and overall product feel.
- Make smart tradeoffs around caching, refetching, optimistic updates, and network performance.
- Own features end to end when needed, including backend routes, database changes, frontend data fetching, and UI implementation.
- Help establish frontend standards, patterns, and best practices as the product and team scale.
Benefits
- Meaningful early-stage equity.
- Comprehensive health and dental coverage.
- 401(k).
- Generous paid time off.
- Gym budget.
- Daily lunch.
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What This Job Offers
Job Type
Full-time
Career Level
Senior
Education Level
No Education Listed
