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Why Reddit built its own AI prototyping tool | Blair Metcalf

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 pr…

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  1. 2026-10-26 11:00 · How I AI
    Why Reddit built its own AI prototyping tool | Blair Metcalf

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