The internal AI tool that’s transforming how Stripe designs products | Owen Williams

About this episode

Owen Williams discusses how Stripe's internal AI tool, Protodash, is revolutionizing product design and prototyping.

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. What you’ll learn: How Stripe built an internal AI prototyping tool using Cursor rules, MCPs, and their design system Why “blurple slop” happens when designers use generic AI tools—and how to fix it The architecture behind Protodash: React router, design system components, and MCP integrations How Stripe prototypes in dev boxes so designers never have to worry about local setup Why “demos, not memos” transformed Stripe’s design review culture How Stripe built design review modes, variant testing, and AI annotation directly into your prototyping tool Why internal tools don’t need to be production-grade to be…

People in this episode

Host: Claire Vo

Guest: Owen Williams

Topics covered

• AI prototyping
• design tools
• product design
• engineering handoffs
• design review culture

Keywords

• AI tools
• prototyping
• design reviews
• engineering
• Stripe
• Cursor
• MCP integrations

Sponsors

Celigo, Cursor

Mentioned in this episode

Organizations: Stripe

Products: Protodash, Cursor

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