Frontend Engineer
Builds and maintains user interfaces using React and Redux, partners with product leaders on frontend infrastructure, and mentors engineers. Requires proficiency in React, JavaScript, TypeScript, and SaaS experience.
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 – 200kSan Francisco, CAFrontend EngineeringOnsite
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
Similar roles
Frontend Engineering jobsFrontend Engineer
Builds intuitive frontend interfaces and contributes across the stack for a cloud cost optimization startup. Requires 3+ years full stack experience with React/Next.js, Python backend, AWS, and onsite work in San Francisco.
Founding Engineer - Frontend
Builds and owns frontend interfaces for AI-powered market due diligence platform, transforming complex data and AI outputs into intuitive visualizations for investment professionals. Requires 3+ years React/TypeScript expertise and modern frontend architecture skills.
Software Engineer - Mission Control
Builds frontend UI/UX platform for defense mission control, including 2D/3D rendering for mission planning, monitoring, and simulation. Requires full-stack web development experience, interest in spatial reasoning, and US citizenship for security clearance.