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SimSimSan Francisco, CA

Founding Design Engineer

Founding engineer owning design and development of a real-time visual canvas for building AI agents, blending UI/UX with frontend engineering. Requires deep React/TypeScript expertise and experience with interactive developer tools.

120k – 200k
On-siteFrontend Engineering

About the role

What You'll Do

  • Own the design and development of Sim’s visual canvas—the real-time, drag-and-drop editor central to our platform
  • Architect and implement intuitive UI systems for complex agentic workflows
  • Shape how developers interact: design, test, debug, and deploy agents seamlessly within the product
  • Ensure the experience remains fast, beautiful, and robust as workflows grow in size and sophistication
  • Bridge visuals and execution: what users see is what runs
  • Set standards for front-end code, component architecture, design systems, and user ergonomics
  • Collaborate across the stack in our Next.js monorepo; ship to production daily
  • Define and refine UX/UI patterns, with attention to developer delight

What We’re Looking For

  • Design-minded engineer with deep experience in React and TypeScript
  • Strong UI/UX intuition—you care how things look and feel, not just how they work
  • Experience building complex, interactive frontend systems (canvas editors, collaborative tools, visual builders, etc.)
  • Proven ability to deliver polished, user-focused developer or creative tools
  • Deep understanding of front-end performance, animation, and responsiveness
  • High agency and ownership—help define the roadmap as well as build it
  • Comfort working in Next.js; backend experience is a plus
  • Experience with real-time systems (WebSockets, CRDTs, etc.) is a plus
  • Visual design skills or open-source contributions are a plus

Skills

ReactTypeScriptNext.jsUi/UxWebSocketsCrdtsCanvas EditorsDesign SystemsFrontend PerformanceAnimations

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