Offline Sync Designer Protocol

Mobile networks are inherently unreliable. Users get on subways, drive through tunnels, or experience network drops. A modern app must not block the user's UI with an infinite spinner when the network fails. This skill designs local-first data layers that feel instant, syncing data quietly in the background.

Core principle: Read from local, Write to local, Sync to remote.

Workflow

1. Map the data domains (What needs to be available offline?)
2. Select the local storage mechanism
3. UI State Strategy (Optimistic vs. Pessimistic updates)
4. Design the Conflict Resolution Policy
5. Define the Background Sync Mechanism