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Mobile Junior Interview Questions

1664 verified Mobile Junior interview questions — solve with answers, learn from explanations, test yourself in a real simulation.

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Sample questions

Mobile Distribution CiDifficulty 1
Before submitting a new app version to the store, which practice most directly reduces the risk of rejection during review?
  • aChecking the build against store review guidelines before submission.✓
  • bIncreasing the app's version number significantly so reviewers see active development.
  • cSubmitting during off-peak hours when review queues are shorter.
  • dAdding more screenshots to the store listing to demonstrate feature completeness.
Explanation:Review outcomes are driven by compliance with review guidelines (permission justification, working flows, accurate metadata), not by version numbering, queue timing, or screenshot count.
Mobile Distribution CiDifficulty 2
A team wants to avoid review cycles that add days to their release timeline. Which pre-submission check would most likely catch a common rejection cause early?
  • aConfirming the build was compiled with the latest available compiler version.
  • bVerifying that every requested permission has a working, reachable code path that uses it.✓
  • cMaking sure the app icon matches the exact pixel dimensions recommended.
  • dEnsuring release notes are translated into as many languages as possible.
Explanation:Reviewers commonly reject apps that request permissions without a functional, reachable use for them. Compiler version, icon sizing, and translation completeness are not typical rejection drivers.
Mobile Distribution CiDifficulty 2
A team submits a build and it's rejected because a login screen is unreachable without a test account, and the reviewer couldn't get past it. What should the team change to avoid this in future submissions?
  • aRemove the login screen entirely before every submission.
  • bReduce the number of screens beyond login.
  • cProvide a demo account so reviewers can get past the gate.✓
  • dAdd a note in the app description explaining the login requirement.
Explanation:Reviewers need an actual path into the app; a demo account or reviewer bypass solves the root cause. Removing the login screen or just adding a text note doesn't give the reviewer a working path.
Mobile Distribution CiDifficulty 1
What does 'staged rollout' mean when releasing a new app version?
  • aReleasing the new version to all users at once but only enabling half the features.
  • bReleasing the backend changes before releasing the app update.
  • cReleasing the update only to devices running the newest OS version.
  • dReleasing to a small percentage of users first, then expanding gradually.✓
Explanation:Staged rollout means controlling how much of the user base receives a version at a given time, starting small and expanding — it's not about feature toggling, backend sequencing, or OS targeting.
Mobile Distribution CiDifficulty 2
A team rolls out a new version to 5% of users. Within hours, crash reports spike sharply compared to the previous version's baseline. What is the appropriate immediate action?
  • aHalt the rollout and roll back for the affected users.✓
  • bImmediately expand the rollout to 100% to gather more crash data faster.
  • cWait for the review team to reject the affected build.
  • dAsk users experiencing crashes to reinstall the app.
Explanation:A sharp crash spike relative to baseline is exactly the signal a staged rollout is designed to catch early, before it reaches more users; halting/rolling back limits blast radius. Expanding further increases harm, and review rejection or reinstall requests don't address the regression.
Mobile Distribution CiDifficulty 3
A rollout configuration is set as follows:
release:
  version: 4.2.0
  rollout_percentage: 10
  halt_on_crash_rate_increase: true

If the app has 200,000 active users, approximately how many would be receiving version 4.2.0 while the rollout sits at this stage?
  • aAbout 2,000 users.
  • bAbout 20,000 users.✓
  • cAbout 180,000 users.
  • dAll 200,000 users, since rollout percentage only affects update visibility timing, not the total.
Explanation:10% of 200,000 is 20,000. Rollout percentage directly controls what fraction of the population receives the new version at that stage, not just visibility timing.

Topics

Fl Dart Async Isolates 75Fl Dart Language Null Safety 75Fl Flutter Persistence Storage 75Fl Flutter Platform Channels Lifecycle 75Fl Flutter Rendering Widget Tree 75Fl Flutter State Management Widgets 75Ios Core Data Swiftdata Persistence 75Ios Lifecycle Background Execution 75Ios Memory Management Arc 75Ios Swift Concurrency Structured 75Ios Swift Type System Optionals 75Ios Swiftui State Rendering 75Kt Android Lifecycle Background Execution 75Kt Android Memory Context Leaks 75Kt Android Room Persistence 75Kt Jetpack Compose State Recomposition 75Kt Kotlin Coroutines Flow 75Kt Kotlin Type System Null Safety 75Mobile Distribution Ci 75Mobile Navigation 75Mobile Networking Offline 75Mobile Performance Battery 75Mobile Security Storage 75Mobile State Data 75Mobile Testing Automation 75Mobile Ui Lifecycle 75Rn Javascript Typescript Fundamentals 75Rn Native Bridge Modules 75Rn Navigation Lifecycle 75Rn Networking Persistence Offline 75Rn Performance Rendering 75Rn React Hooks State Management 75

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