Introducing Moonlake, AI for creating world simulations.

THE ROLE

We're looking for a Product Engineer who combines strong full-stack engineering with sharp product judgment and a bias for shipping.

We want someone who can:

- Own a product surface end-to-end - not a ticket queue
- Turn a rough idea into a shipped, measured feature
- Build full-stack, front to back (React / Next.js / TypeScript + Python)
- Make product decisions without waiting for a PM
- Ship fast and iterate on real usage

WHAT YOU'LL DO

- Scope fuzzy product goals into testable, instrumented features, and measure their impact
- Break down ambiguous work, sequence it, and drive it to production
- Collaborate closely with research, engineering, and founders building world models and embodied AI systems
- Use AI-native engineering tools (Claude Code, Codex, or similar) to ship faster

WHAT WE'RE LOOKING FOR

- A track record of shipping real product in ambiguous, fast-moving environments - you turn ambiguity into outcomes
- ~3+ years building and shipping production web products (we index on track record over years)
- Strong full-stack engineer, excellent React/Next.js/TypeScript; with solid backend engineering judgment: you design sound database schemas and system architecture and understand the tradeoffs
- Strong technical communication - you turn ambiguity into clear plans, explain tradeoffs to non-engineers, communicate with high signal, and drive alignment proactively
- Sound product and UX judgment - you decide what's worth building

TECHNICAL EXPERIENCE WE VALUE

- React / Next.js / TypeScript, Tailwind / shadcn, and modern web application architecture
- Building product features and UI/UX for agentic systems - where AI takes actions, reasons over state, and drives multi-step, long-horizon workflows with streaming UIs, generative UI, etc.
- Building scalable backend services and APIs
- AI-native product workflows

BONUS POINTS (any one is a plus, none required)

- Extensive experience building and shipping agent / LLM-powered product features
- Founding / 0→1 engineer, or entrepreneurial experience
- Physics AI / simulation and robotics stack - Isaac Sim, MuJoCo
- 3D asset workflows (Blender) or other world-building / assets-building tools

Why This Role Matters

Moonlake is building tools that sit between:

• AI systems and human creativity
• Simulation and interaction
• Research infrastructure and product experience

The interface layer is critical. These products must make highly complex systems feel intuitive, responsive, and powerful.

You'll help define how people interact with the next generation of world-building and embodied AI tools.

We are committed to being an on-site, in-person team currently based in San Francisco.