Founding Design Engineer

Summary

Sim is an innovative company focused on building a visual, agent-building platform for AI developers. The Founding Design Engineer will own the design and development of this platform, shaping the user experience and ensuring the interface is intuitive and effective for thousands of developers.

Responsibilities

• 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

Skills

• 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

Qualifications

Must Haves

• 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

Benefits

• Visa sponsorship available.
• Comprehensive health insurance
• Relocation support