#sync

5 sync interview questions, asked at Apple, Cursor, Hex and 1 more company. Last asked Aug 2026.

Design cloud photo storage with sync across devicesSystem designDesign a photo library in the cloud that keeps every one of a user's devices in sync: upload new photos from a phone, see them on the other devices, and propagate edits and…
Last asked Aug 2026
Design a notes app that syncs across devicesSystem designDesign a notebook app whose notes stay in sync across a user's devices. Cover the data model, how changes made offline are sent and merged, how conflicting edits are resolved, and…
Last asked Jul 2026
Design versioned IDE settings for users and teamsSystem designDesign the service that stores an editor's settings for each user and for teams, so a user's setup follows them across machines and a team can set shared defaults. Cover how user…
Last asked Jul 2026
Design wallpaper sync across a user's devicesSystem designWhen a user sets a wallpaper on one device, it should show up on their other devices. Design that sync: storing the image and its settings, notifying the other devices, devices…
Last asked Jun 2026
Design a dashboard with two-way data syncSystem designDesign a dashboard whose data is kept in sync in both directions with a source system: changes made in the source show up in the dashboard, and edits made in the dashboard are…
Last asked Feb 2026