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How Reddit’s designers build ultra-realistic prototypes with Figma + Cursor - YouTube

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Blair Metaf demonstrates a custom prototyping harness that enables product managers and designers to generate production-like features without needing direct access to GitHub. This workflow integrates design systems and real user data to streamline collaboration and alignment across teams, significantly reducing the time required to move concepts from development into a production environment. Follow along using the transcript. Blair Metaf demonstrates a custom prototyping harness that enables product managers and designers to generate production-like features without needing direct access to GitHub. This workflow integrates design systems and real user data to streamline collaboration and alignment across teams, significantly reducing the time required to move concepts from development into a production environment. Follow along using the transcript.

Blair Metcalf is the principal UX engineer at Reddit and the builder of Reddit Proto, the company’s in-house vibe-coding harness. With a design system MCP that maps Reddit’s product language to production code, Proto has reached 100% adoption across Reddit’s UX and product org, and more than 700 prototypes are live on it. *What you’ll learn:* 1. Why Reddit built its own prototyping harness 2. How designers share prototypes with leadership safely 3. Why real Reddit data beats mock data 4. How one annotation becomes a code edit in Cursor 5. What a “feature capsule” is 6. Why Blair built a…

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