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URL Shortener
Twitter/News Feed
WhatsApp/Chat System
YouTube/Video Streaming
Uber/Ride Sharing
Amazon E-commerce
Notification System
Rate Limiter
Distributed Cache
Search Autocomplete
Google Drive/Dropbox
Payment System
Ticketmaster
Web Crawler
Instagram
Twitter Search / Full-Text Search Engine
Metrics/Monitoring System (like Datadog)
Google Maps
Job Scheduler (like Cron)
Online Code Judge (like LeetCode)
Collaborative Editor (Google Docs)
Stock Exchange / Trading System
Food Delivery System (like DoorDash)
Distributed Logging System (like ELK)
Recommendation System
Ad Serving System
Ride-Sharing Matching Algorithm
Distributed Key-Value Store
Unique ID Generator
Proximity Service
Nearby Friends
Hotel Reservation System
Distributed Email Service
S3-like Object Storage
Real-time Gaming Leaderboard
Digital Wallet
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