Design a Mobile Offline Sync Engine for iOS
Published:
Design a mobile sync engine that handles offline writes, conflict resolution, and reliable reconciliation when connectivity returns.
← Back to Interview Hub
Design a Feature Flag Platform for Mobile Apps
Published:
Design a mobile feature flag platform that supports safe rollouts, dynamic targeting, offline defaults, and fast kill switches.
Design an Offline-First Sync System for Notes App
Published:
How to design reliable offline sync for mobile apps: local-first writes, durable queues, retries, and conflict policies.
Design a Push Notification Personalization System
Published:
Design a push personalization system that improves engagement without notification spam or policy violations.
Design a Mobile Crash Intelligence Platform
Published:
How to design a crash platform: ingestion, symbolication, issue grouping, alerting, and ownership routing.
Design an AI Agent Flow System for Mobile Development
Published:
Design an AI agent flow system for a mid-scale mobile development team. Integrate multiple external AI services (Cursor, Claude API, OpenAI, testing AI tools) to automate code review, testing, documentation, and architecture analysis without building custom UIs.
Design a Short Video App (TikTok/Sora-style)
Published:
Design a TikTok-style short video app with AI video generation (OpenAI Sora), infinite scrolling feed, video player pooling, upload optimization, and content delivery that scales to millions of users.
Design an AI Chat App (ChatGPT-style)
Published:
Design an AI chatbot like ChatGPT for iOS: streaming vs traditional sockets, handling multiple concurrent conversations, multimodal inputs (images/videos), and real-world API integration with OpenAI, Anthropic, and Google AI.
Design a Real-Time Chat System for iOS
Published:
Design a WhatsApp-like messaging system with real-time message delivery, local storage, media sharing, typing indicators, and offline message queuing.
Design an Instagram-like Feed
Published:
Design the architecture for an Instagram-like feed that displays images/videos efficiently, supports infinite scrolling, handles offline mode, and scales to millions of users.
Design an Image Caching System
Published:
Design an efficient image caching system that downloads and caches images, manages memory and disk cache, handles eviction intelligently, and provides thread-safe operations.
App Launch Time Optimization
Published:
Your app takes 3 seconds to launch. How do you identify bottlenecks and reduce launch time to under 1 second? Complete guide with Instruments, optimization strategies, and real-world techniques.