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SimSimSan Francisco, CA

Software Engineer, Frontend

Builds and owns the frontend platform including agent-building canvas, UI components, and real-time interactions using React and TypeScript. Collaborates with engineering, design, and product to ship performant developer experiences at scale in a Next.js monorepo.

140k – 220k
On-siteFrontend Engineering

About the role

What You'll Do

  • Architect and develop key frontend systems, focusing on visual, interactive experiences that empower users to build and manage AI agents
  • Lead the implementation of new features, UI components, and real-time interactions in a Next.js monorepo
  • Ensure the frontend experience is performant, polished, and delightful at scale
  • Set standards for front-end code, UI architecture, and design systems
  • Collaborate with engineering, design, and product teams to deliver seamless developer workflows
  • Extend our custom component library, and extend our existing design system
  • Prototype and iterate rapidly, shipping high-impact improvements daily

What We’re Looking For

  • Deep experience in React and TypeScript
  • Strong intuition for UI/UX design and developer experience
  • Proven ability to build complex, interactive frontend applications (canvas editors, visual builders, collaborative tools, etc.)
  • Understanding of frontend performance, animation, and real-time systems (WebSockets, CRDTs, etc.)
  • High agency and ownership mentality—drive features from ideation to launch

Nice to have: Experience with design systems, Next.js, and open-source contributions

Skills

ReactTypeScriptNext.jsWebSocketsCrdtsUi/UxDesign SystemsCanvas Editors

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