Claire Vo · 2 min read · Gen AI Tools
The internal AI tool that’s transforming how Stripe designs products | Owen Williams
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Owen Williams, Stripe's design manager, built Protodash, an internal AI-powered prototyping platform that lets designers and PMs create Stripe dashboard prototypes without writing code. It evolved from Cursor rules and React components into a browser-based prototyping studio with design review modes, variant testing, and AI-assisted iteration, running in dev boxes. The tool has fundamentally changed how Stripe approaches prototyping, design reviews, and engineering handoffs, with PMs now among its primary users.
Key Takeaways
- Protodash enables code-free prototyping for Stripe dashboards using Cursor rules, MCPs, and the design system.
- It runs as a browser-based studio with dev-box prototypes, design review modes, variant testing, and AI-assisted iteration.
- PMs now use Protodash as much as designers, reshaping prototyping, design reviews, and engineering handoffs.
- The architecture includes React router, design system components, and MCP integrations designed for quick in-browser demos.
- A demos-first approach (demos, not memos) transformed Stripe's design review culture.
Excerpt
Owen Williams is a design manager at Stripe who built Protodash, an internal AI-powered prototyping platform that lets designers and PMs create high-quality Stripe dashboard prototypes without writing code. What started as a bundle of Cursor rules and React components evolved into a full web-based prototyping studio that runs in dev boxes, complete with design review modes, variant testing, and AI-powered iteration. Surprisingly, PMs now use Protodash just as much as designers, fundamentally changing how Stripe approaches prototyping, design reviews, and engineering handoffs. Listen or watch on YouTube , Spotify , or Apple Podcasts What you’ll learn: How Stripe built…