Design a URL shortener like Bitly
Design a RAG (Retrieval-Augmented Generation) pipeline for enterprise knowledge base
Design Twitter/X — a real-time social media feed
Design a ride-sharing service like Uber
Design an AI agent orchestration platform like LangChain/CrewAI
Design a messaging app like WhatsApp
Design an LLM inference serving system with auto-scaling
Design a video streaming platform like Netflix
Design an e-commerce marketplace like Amazon
Design an AI-powered code review and generation system like GitHub Copilot