Grokking Modern Mobile System Design Interview
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Offline First

Offline-first design makes useful behavior possible without an immediately successful network request. It does not mean that every action can complete offline.

Define the promise for each action, then make storage, synchronization, and the UI support that promise.

Describe offline capability per action

For a notes app:

ActionOffline behaviorWhat the user needs to know
Read a downloaded noteAvailable locallyThe copy may be outdated
Edit a noteSave a local revisionSaved here is different from synced

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