📱 DevCrack: Mobile Interview Preparation

The Ultimate Guide for Senior/Staff Mobile Engineers Covering Android, iOS, System Design, Leadership, and emerging tech.

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🚀 Repository Contents

🤖 Android

Deep dives into modern Android development.

• Kotlin: Coroutines, Flow, Internals.
• Jetpack Compose: State, Side Effects, Performance.
• Architecture: Clean, MVI/MVVM, Modularization.
• Data: Room, SQLite, Serialization.
• Media: ExoPlayer Mastery (architecture, DRM, caching).
• Performance: Memory, App Startup, Battery, Profiling.
• Tools: Gradle Mastery, R8, Dagger/Hilt.
• System Design: Offline-first patterns, Image Loading Design.

🍎 iOS

A structured 12-chapter guide for iOS mastery.

• Core: Swift, Memory Management (ARC), Concurrency (GCD/Actors).
• UI: SwiftUI (Identity, Performance), UIKit.
• Architecture: MVVM-C, VIPER, Testing.
• Networking: URLSession, Combine, Async/Await.

🏗 System Design

Real-world architecture for large-scale mobile apps.

• Concepts: Scalability, Offline-Sync, Push Notifications.
• Deep Dives: Design a Chat App, Feed, Video Streaming.

👨‍💼 Leadership & Management

For Engineering Managers and Staff Engineers.

• Management: 1:1s, PIPs, Performance Reviews.
• Technical Lead: Managing Tech Debt, RFCs, Architecture decisions.
• Behavioral: STAR Method, Conflict Resolution.

🔮 Emerging Tech

Future-proof your career.

• AdTech & Media: VAST/VPAID, ExoPlayer internals, DRM.
• On-Device ML: CoreML, TFLite.
• Cloud Native: Serverless, Edge, BFF.
• AI Engineering: RAG, Agents, Vector Databases.
• VisionOS: Spatial Computing & Spatial Design.
• Accessibility: WCAG, TalkBack/VoiceOver.

💼 Career Strategy

Maximize your offer.

• Resume: Impact-driven writing.
• Negotiation: Salary leverage and scripts.
• Take-Home: Rubrics and best practices.

🧠 Algorithms

Mobile specific data structures.

• LRU Cache: Image caching logic (Doubly Linked List).
• QuadTree: Location clustering for Maps.
• Trie: Autocomplete search optimization.

⚔️ Cross Platform

• Flutter: Widget Lifecycle, Engine.
• React Native: Bridge, JSI, New Architecture.
• KMM: Kotlin Multiplatform Mobile.

🛡 Security

• OWASP Mobile Top 10: Vulnerabilities and Mitigations.
• Defense: Root Detection, SSL Pinning, Obfuscation.
• Screen Recording Prevention: Banking-grade security guide (FLAG_SECURE, Android 14+ detection).

🎤 Interviews

• Job Search Guide: "Cheat Codes" for finding jobs (Boolean strings, templates).
• Product Based: Interview templates for Amazon, Google, Flipkart, Swiggy, etc.
• Service Based: Interview templates for TCS, Infosys, Accenture, etc.

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✍️ Contributing

1. Fork the repo.
2. Create a folder or file in the appropriate section.
3. Add questions/answers in Markdown.
4. Submit a Pull Request.

See CONTRIBUTING.md for more.

📝 License

MIT License