About the role
About Sim
Sim is building the leading platform for AI agents—enabling developers and enterprises to visually create, launch, and manage high-performing agents that automate the world’s workflows. Our mission is simple: agents will run the world, and Sim is the primary means by which that happens. We’re backed by world-class investors including Standard Capital, Paul Graham, Perplexity, SV Angel, and Y Combinator, and we’ve been open source from day one.
We're a small, fast-moving team based in San Francisco, building together in person every day. 70,000+ developers use Sim; your work ships fast and impacts real users at scale. We believe in ownership, excellence, and ambitious builders shaping the future from the ground up.
About the Role
As a Software Engineer, Frontend at Sim, you'll own the development of our agent-building canvas and frontend platform. You’ll architect intuitive user experiences, build robust and high-performance UI components, and help define how thousands of developers create with Sim. Working with engineering, product, and design, you’ll deliver features from concept to production, directly shaping our product’s design, performance, and developer experience.
What You'll Do
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Architect and develop key frontend systems, focusing on visual, interactive experiences that empower users to build and manage AI agents
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Lead the implementation of new features, UI components, and real-time interactions in a Next.js monorepo
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Ensure the frontend experience is performant, polished, and delightful at scale
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Set standards for front-end code, UI architecture, and design systems
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Collaborate with engineering, design, and product teams to deliver seamless developer workflows
