Building and Scaling UI Systems for Internal Tools at Meta

▤ Summary

Meta’s internal tools evolved from a dated, fragmented set of UI patterns into a shared design system called XDS. The team solved adoption by targeting painful use cases early, piloting the system on visible tools, and building community contribution workflows around it. As XDS scaled, the team added lint rules, tests, rollouts, and codemods to manage risk across a massive monorepo and thousands of internal surfaces. The talk also covers how the team survived organizational change by creating a council and finding a stable home, then expanded the platform beyond UI into observability, routing, and AI-assisted tooling.

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