Engineering · Free Practice

Mobile Developer Scenarios

Build native and cross-platform mobile applications.

Scenarios

Skills Tested

Salary Range

$75k–$170k

Job Demand

high

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Difficulty Distribution

Beginner0

Intermediate1

Advanced1

Skills You'll Practice (6)

iOS debuggingCrash analysisVersion compatibilityOffline-firstSync algorithmsConflict resolution

All 2 Scenarios

Click any scenario to practice it. No account required.

intermediatetroubleshoot

App Crashing on iOS 17

Your iOS app is crashing for users on iOS 17. Crash rate is 12%. It works fine on iOS 16 and earlier. Your app was compiled against iOS 16 SDK. You have Crashlytics data. Walk me through diagnosis and fix strategy.

iOS debuggingCrash analysisVersion compatibility

20 min

advanceddesign

Design Offline-First Chat App

Design a chat app that works fully offline: messages queue when no internet, sync when reconnected, handle conflicts (multiple devices), show delivery status. Walk me through data model, sync strategy, and conflict resolution.

Offline-firstSync algorithmsConflict resolution