IBM Mobile Application Development Advanced Practice Exam: Hard Questions 2025

A financial services mobile app experiences memory leaks when users navigate between multiple screens displaying real-time stock data. The app uses a publish-subscribe pattern for data updates. Profiling reveals that observer objects are not being deallocated. Which architectural approach would BEST resolve this issue while maintaining real-time updates?

Your hybrid mobile application built with a web-to-native bridge framework needs to pass large binary data (images and video chunks) from the native layer to the JavaScript layer for processing. The current JSON serialization approach causes significant performance degradation and UI freezing. What is the MOST efficient solution?

During performance testing of a mobile app with offline-first architecture, you discover that synchronization conflicts occur frequently when multiple users edit the same record offline and later sync. The current last-write-wins strategy causes data loss. Which conflict resolution strategy would be MOST appropriate for a collaborative document editing scenario?

You are developing a React Native application that requires integration with a legacy native SDK available only as a compiled library without source code. The SDK uses callbacks and delegates extensively. After initial integration, you encounter random crashes only in production builds with ProGuard/R8 optimization enabled. What is the MOST likely cause and solution?

Your mobile app's automated UI testing suite has become flaky with intermittent failures on asynchronous operations, particularly when testing screens that load data from network APIs. Tests pass locally but fail 30% of the time in CI/CD pipeline. Which combination of strategies would MOST effectively stabilize the test suite?

An enterprise mobile app submission to the Apple App Store was rejected due to excessive crash reports from App Store Connect analytics, though internal testing showed no crashes. Investigation reveals crashes occur only on specific device models with particular iOS point releases. What is the BEST approach to diagnose and resolve this issue before resubmission?

Your organization needs to distribute a mobile app to 5,000 enterprise users across multiple countries with different regulatory requirements. The app handles sensitive health data and requires different feature sets based on regional compliance (GDPR, HIPAA, local regulations). Which deployment strategy would BEST meet these requirements?

A mobile application architecture uses microservices where each service requires different authentication tokens. The app currently stores multiple tokens in shared preferences/keychain and manages refresh logic separately for each service. This approach has led to token synchronization issues and security concerns. What architectural pattern would BEST address these issues?

During a phased rollout of a critical app update to 10% of users, monitoring reveals that the new version has a 15% decrease in session duration but no crashes or errors are logged. User reviews mention 'the app feels slower.' Performance monitoring shows API response times are unchanged. What is the MOST likely cause and appropriate debugging approach?

Your app was rejected from the Google Play Store due to violations of the new Data Safety section requirements, despite having a comprehensive privacy policy. The app uses third-party SDKs for analytics, crash reporting, and advertising. What is the MOST comprehensive approach to ensure compliance and approval?