- Design a real-time event aggregator service
- Design a real-time commenting system
- Design Amazon price tracking service
- Design a version control system
- Design a cloud storage service like Dropbox
- Design Facebook newsfeed
- Design Yelp/places nearby - a service to support querying nearby places of interest (lat, long, max-distance)
- Design a i18n framework
- Design Visa
- Design a KV storage service for caching data
- Design Netflix
- Design an ads delivery system
- Design a slack like messaging service
- Design a streaming gaming service (Stadia)
- Design a continuous integration service
- Design typeahead service for search suggestions
- Design a distributed source code/project building system
- Design Ticketmaster
- Design a URL shortening service
- Design pastebin
- Design an APU rate limiting service
- Design Twitter search
- Design a distributed queue system
- Design a Uber like service
- Design a distributed logging system
- Design a video processing service
- Design a single node storage engine for key-value pairs
- Design an Internet web crawler
- Design a live streaming service
- Design a real-time monitoring and alerting service
- Design Twitter timeline
- Design Google Map
- Design a notification service
- Design Instagram
- Design a crawler for Wikipedia
- Design a leaderboard system
- Design an online judge system
- Design a UGC review system
- Design a job scheduling service
- Design a push notification service
- Design a load balancer
- Design a stock brokage service
- Design S3 object store
- Design a time series database
- Design Newsfeed API
- Design a real-time counter service
- Design Google photos app
- Design an airline reservation system
- Design an ads serving system
- Design a code deployment service