Amazon Mobile Developer Interview Preparation Guide - Mid Level

Articulate why you're interested in Amazon specifically and why this mobile team appeals to you (not just general reasons).

Basic familiarity with Amazon's 16 Leadership Principles and how they apply to your past work.

Ask informed questions about team charter, technology stack, size, location, and current priorities to show genuine interest.

Clearly communicate your 2-5 years of mobile development experience, platforms you've worked with (iOS/Android/cross-platform), and the types of applications you've built.

Demonstrate systematic debugging methodology, asking clarifying questions, and thinking through edge cases during the interview.

Be comfortable implementing and using common data structures (arrays, sets, maps, trees) in your platform. Solve leetcode-style problems with mobile context.

Knowledge of camera APIs, location services, push notifications, local storage, and how to integrate third-party SDKs. Understand async operations and network requests.

Understanding of battery efficiency, memory management, scrolling/rendering performance, and network optimization. Know profiling tools in your platform.

Ability to build custom UI components from scratch using platform-native tools (UIView in iOS, View in Android, or native in React Native/Flutter). Include layout management, event handling, and state binding.

Deep understanding of your target platform's lifecycle (iOS UIViewController/SwiftUI state management or Android Activity/Fragment/Compose state). Know how to handle configuration changes, memory pressure, and app suspension.

Mobile-specific security: secure storage, encryption, authentication, SSL pinning, OWASP Mobile Top 10, and platform-specific security APIs.

Handling poor network conditions, implementing retry logic, request batching, compression, and monitoring. Understanding of HTTP caching, request throttling, and timeout handling.

Designing systems for caching, offline-first architecture, data synchronization, and persistence. Understand local databases (SQLite, Realm, CoreData) and sync strategies.

Understanding of MVC, MVVM, MVP, and modern architectural patterns (Clean Architecture, Redux/Redux-like patterns). Know when and why to use each pattern.

Master async patterns in your platform: callbacks, promises/futures, RxJava/RxSwift, async-await, coroutines, or GCD. Understand thread safety and race conditions.

Deep understanding of memory profiling, garbage collection (Android) or ARC (iOS), leak detection, and optimization techniques. Know how to identify and fix performance bottlenecks.

Implementing navigation between screens, managing navigation stack, handling deep links, and maintaining state across navigation.

Graceful handling of network errors, empty states, loading states, and unexpected input. UI should never crash.

Building layouts that work across different screen sizes and orientations. Use platform layout systems effectively (AutoLayout, Flexbox, ConstraintLayout).

Proper state handling, avoiding memory leaks, managing lifecycle events, and ensuring data consistency through state transitions.

End-to-end implementation of a mobile feature: UI layout, state management, data binding, navigation, and error handling. Must be production-ready code.

Understanding when to use native vs cross-platform, choosing between frameworks (React Native, Flutter, native), and discussing tradeoffs.

Designing systems that work offline and sync when network is available. Local database design, conflict resolution, and sync strategies.

Designing multi-level caching (in-memory, disk, network), cache invalidation, and tradeoffs between freshness and performance.

Designing for limited battery, variable network, storage constraints, and device capabilities. Discussing how to optimize for these constraints.

Designing the overall structure of the mobile app: feature modules, shared components, dependency injection, and component communication patterns.

Designing APIs that work well for mobile: minimal payload, pagination, versioning, error responses, and batching. Discuss REST vs GraphQL tradeoffs for mobile.

Designing systems that scale with new features and team growth. Code organization, testing strategy, and technical debt management.

Ability to diagnose production issues from logs, crash reports, or user reports. Systematic troubleshooting approach and using platform debugging tools.

For iOS: advanced threading with GCD, memory management edge cases, reactive programming with Combine. For Android: Kotlin coroutines, LiveData/StateFlow, advanced composition.

Examples of major architectural choices you've made: state management library selection, navigation framework, data persistence strategy, or modularization approach.

Profiling tools, identifying bottlenecks, and optimization techniques. Real examples from your work: what was slow, how you measured it, how you fixed it.

Examples of mentoring junior developers, improving team processes, or growing in your role. For mid-level, show you're ready to grow without needing constant guidance.

Examples of learning new technologies, skills, or domains. How you approach unfamiliar problems and stay updated in mobile development.

Examples of meeting commitments, shipping features on time, handling pressure, and achieving ambitious goals.

Examples of building trust with colleagues, following through on commitments, admitting mistakes, and being reliable.

Examples of taking full responsibility for outcomes, not blaming others, seeing problems through to resolution, and going above scope when needed.

Examples of how you've prioritized customer needs, gathered customer feedback, or made decisions based on customer impact.