Real-world system design questions asked at Meta, Snap, Apple, and other top companies. Each problem includes architectural diagrams, code examples, trade-off discussions, and what interviewers want to hear.
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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.
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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.
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Design a WhatsApp-like messaging system with real-time message delivery, local storage, media sharing, typing indicators, and offline message queuing.
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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.
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Design an efficient image caching system that downloads and caches images, manages memory and disk cache, handles eviction intelligently, and provides thread-safe operations.
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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.