Grokking Modern Mobile System Design Interview
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Capstone: Scoping Three Questions

This exercise applies scoping to three different questions: a ride-hailing app, an analytics SDK, and chat in an existing app.

For each question, practice a five-minute opening explanation. This is an exercise budget, not a rule for every interview.

Record the user or caller, main actions, system boundary, exclusions, important quality requirements, and one question that changes the design. Add a calculation only if it helps a decision.

1. Ride-hailing app

“Design the rider app for a ride-hailing service.”

Before reading the example, decide where the journey begins and ends

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