Design Engineer

San Francisco, United StatesOn-site

Responsibilities

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
Shape the design DNA of Sim and influence the future of how agents are built. - Real users, real scale. 80,000+ developers use Sim—your work matters immediately. - World-class backers.

ABOUT THE ROLE You'll own the design and development of Sim’s visual, agent-building platform—the canvas where developers build, connect, and launch AI agents.
Your work blends UI/UX design with engineering, shaping the interface, experience, and real-time systems at the heart of our product.
Sim has been called "Figma for AI agents," and you’ll push this further—making our canvas more powerful, delightful, and performant as workflows grow.
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 Why Sim - Foundational impact.

Series A led by Standard Capital, with Paul Graham, Perplexity, SV Angel, and Y Combinator. - Open source from day one. 28,000+ GitHub stars and an active builder community. - Competitive salary + meaningful equity.
Comprehensive health insurance and relocation support. - Visa sponsorship available.