Mobile Platform Knowledge Questions

Understanding the iOS and Android mobile platforms, their development ecosystems, and the practical tradeoffs of native and cross platform approaches. Topics include platform languages and toolchains such as Swift and Objective C for iOS and Kotlin and Java for Android, platform architecture and application lifecycle, user interface frameworks and design guidelines, performance and memory considerations, platform specific security and permission models, testing strategies and device fragmentation, build and release processes including app store distribution and versioning, continuous integration and continuous delivery for mobile, and interoperability with backend services. Candidates should be able to explain when to choose native versus cross platform solutions, discuss debugging and profiling tools, and describe how platform constraints influence design and operational decisions.

HardTechnical

77 practiced

Discuss pros and cons of using over the air code update mechanisms such as CodePush for React Native or similar hot patching in other frameworks. Include app store policy constraints, security and integrity risks, compatibility issues with native APIs and ABI changes, and outline a safe implementation plan that includes verification, rollback and legal considerations.

MediumTechnical

64 practiced

Describe how ProGuard and R8 work in the Android build process. Explain what minification, tree shaking and obfuscation do, how to create rules to keep classes accessed by reflection, and how to debug issues caused by incorrect rules. Also explain the role of the mapping file and how it is used with crash reports.

HardTechnical

62 practiced

You must implement a custom camera feature that captures high resolution photos and short videos on Android 7+ and iOS 12+. Describe how you would handle camera permissions, choose between Camera2 and CameraX on Android and AVFoundation on iOS, select capture resolutions and formats, manage memory when dealing with large images, handle device rotation and EXIF orientation, and ensure smooth performance and acceptable battery usage.

MediumSystem Design

58 practiced

You must refactor a monolithic Android app into modular feature and domain modules to speed up build times and support independent team ownership. Propose a modularization strategy including module boundaries, dependency rules, Gradle configuration recommendations, caching and CI strategies, and how to share resources like branding and networking clients without creating tight coupling.

HardSystem Design

59 practiced

Design a rollout, feature flagging and release strategy for a mobile app with millions of users. Include percentage based staged rollouts, server-side feature flags, client-side evaluation considerations, A/B testing, metrics to monitor for adoption and crashes, kill switches, and how to mitigate a bad release quickly.

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