Full Stack Engineer San Francisco & Paris

As a Founding Full Stack Engineer, you'll own critical parts of our product and infrastructure. You'll work across the stack, from real-time 2D/3D UIs to backend systems that power an agentic game creation workflow in seconds.

You won't just build features, you'll shape the product, the architecture, and the user experience from the ground up. You'll play a crucial role in the team and have a direct impact on what we ship and how fast we move.

If you're excited about building magical creative tools and pushing the boundaries of what's possible, this role is for you.

What you’ll do

• Design, build, and own full-stack features, from backend logic to frontend UI
• Collaborate on real-time editors, multiplayer systems, and publishing flows
• Work closely with AI pipelines for asset generation and logic synthesis
• Help define product direction through tight feedback loops with users
• Contribute to the engineering culture and help recruit the next 10x A-player team

Stack

Frontend: Next.js, React, TypeScript, Tailwind, WebGL/WebGPU (Three.js + custom game UIs)

AI: Integration with genAI pipelines for asset generation, animation, and agentic logic

Game Engine: Web-based, custom runtime for game preview and execution

You might be a fit if...

• You’ve built and shipped full products end to end
• You’re comfortable navigating backend, frontend, and infra
• You care deeply about product design and UX, especially for creative tools
• You move fast, love ownership, and thrive in high-autonomy teams
• Your workflow is already AI-augmented
• You’re excited by games, AI, and creative platforms

Bonus: You’ve hacked on game engines, graphics, or multiplayer systems (side project, hackathon, or main project)

What we offer

• A defining role in reshaping how games are built and played by billions.
• Founding team equity — build and own a piece of what you create.
• Unlimited learning budget — courses, tools, coaching: whatever helps you grow.
• Extreme autonomy & ownership — you'll lead, not follow.
• Work with A-players — a team of builders, AI-native, and obsessed with the mission.
• Team offsites & trips — we move fast, and we celebrate hard.