Grokking Modern Mobile System Design Interview
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Introduction: Client Architecture

An app needs more than screens and API calls. It needs clear rules for who loads data, who changes it, and who keeps it when a screen closes.

Client architecture describes these responsibilities and how the parts of the app work together. In an interview, your goal is to explain these decisions. Naming an architecture pattern is not enough.

Start with one user action

Consider an order history screen. The user opens the screen, sees saved orders, and refreshes them.

The app must answer several questions:

  • Which component reads the saved orders?
  • Which component requests new orders?

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