How do you migrate a breaking change in a mature design system?

WHAT THIS TESTS: This question evaluates whether you view design system maintenance as a socio-technical contract rather than a pure UI task. The interviewer wants to see if you understand that a breaking change in a mature system affects hundreds of designers, product roadmaps, and production codebases. Success requires balancing semantic versioning discipline, automated migration tooling, transparent communication, and stakeholder management without halting every team's sprint.

A GOOD ANSWER COVERS: First, define what a breaking change means for your system using a decision tree and socialize it across the organization so teams know what to expect from SemVer major bumps. Second, identify key consumers, a representative subset of teams with varied adoption levels and complexity, and invite them to beta test the new component and migration guide before public release. Third, publish a phased timeline: announce deprecation in the current major version, release the new version alongside migration docs, set a hard removal date, and use analytics to track adoption across hundreds of files. Fourth, provide automation such as Figma swap libraries, codemods, or find-and-replace scripts so the migration is not manual busywork for dozens of designers. Fifth, communicate through multiple channels including Slack, office hours, and embedded design system liaisons to ensure the message reaches teams who do not read release notes.

COMMON WRONG ANSWERS: A major red flag is suggesting an overnight global swap or deleting the old component immediately without a deprecation window. Another is focusing entirely on the visual redesign while ignoring the migration cost for consumers. Candidates also stumble by proposing a single communication email and assuming that is sufficient, or by failing to mention versioning strategy at all. Avoid answers that treat designers as passive recipients rather than partners in the rollout.

LIKELY FOLLOW-UPS: The interviewer may ask how you would handle a team that refuses to migrate before the deadline, what metrics you use to decide if a component is worth deprecating, or how you would coordinate the Figma library change with a corresponding React component update. They might also probe whether you would support both versions indefinitely and how you would resource the maintenance overhead.

ONE CONCRETE EXAMPLE: At Spotify, the Encore design system team faced breaking changes by first defining their own breaking change decision tree. They selected key consumers ranging from high-adoption legacy products to new low-adoption teams to beta test major releases and migration guides. Before finalizing a new major version, they validated that their migration documentation actually worked in real consumer files, then rolled out the change with clear SemVer signaling and analytics tracking to ensure adoption.

Source: designsystemsforfigma.com