Tiny URL (URL Shortener)
News Feed (Twitter, X)
Messaging App (WhatsApp, WeChat, Messenger)
Rate Limiter
Autocomplete System (Google Search)
Web Crawler
Video Streaming and Sharing Platform (YouTube, Vimeo)
Top-K Leaderboard
Notification System
Social Media Platform (Instagram)
Cloud File Sharing Service (Dropbox, Google Drive)
Ride Sharing Service (Uber, Lyft)
Proximity Service (Yelp)
Ticket Booking System (Ticketmaster)
Hotel Reservation System (Airbnb, Booking.com)
E-Commerce Platform (Amazon, eBay)
Distributed Task Scheduler
Dating App (Tinder)
Music Streaming Service (Spotify)
Short-Form Video Platform (TikTok, YouTube Shorts)
Payment Gateway (Stripe)
Metrics Monitoring and Alerting (Datadog, Prometheus)
Ad Click Event Aggregation (Google Ads)
Digital Wallet (Venmo, Cash App)
Stock Exchange (NASDAQ, NYSE)
Flash Sale System
Google Maps
Distributed Message Queue