Software Engineer, Platform

What You'll Do

• Own the Sim visual canvas — the real-time, drag-and-drop workflow editor at the heart of the product
• Architect and build the front-end systems that render, connect, and manage complex agent workflows
• Design the interaction model for how developers create, test, debug, and deploy agents visually
• Build the bridge between visual flows and the underlying execution engine — ensuring what you see is what runs
• Drive performance and responsiveness across the editor, even as workflows grow in complexity
• Shape developer ergonomics and UX patterns across the platform — block configuration, variable wiring, real-time feedback, deployment flows
• Work across the stack in our Next.js monorepo when needed, shipping to production daily
• Set front-end standards for the codebase — component architecture, state management, testing patterns

What We're Looking For

• Design-minded full-stack engineer with deep React and TypeScript experience
• Strong sense of product and UX — you care deeply about how things feel, not just how they work
• Experience building complex, interactive UIs — canvas editors, real-time collaborative tools, visual programming environments, or similarly demanding front-end systems
• Track record of shipping polished developer tools or creative tools to production
• Deep understanding of front-end performance — you know how to keep complex interfaces fast and responsive
• High agency and ownership — on a team this small, you define the roadmap as much as you execute it
• Comfort working across the stack in a Next.js monorepo; backend work is part of the job

Nice-to-haves:

• Experience with real-time systems (WebSockets, CRDTs, or similar)
• Experience with AWS infrastructure
• Contributions to open-source projects