Problems

Build a scalable URL shortening service that supports creation, redirection, caching, and analytics ingestion for a fast user experience.

Create a tracking system for orders, restaurant updates, and rider location streaming with live customer notifications.

Design a media platform for uploading, processing, storing, and delivering photos to users with edge caching and metadata search.

Build a request rate limiting service that protects APIs from abuse and ensures fair access for clients.

Design a real-time messaging system with presence, message delivery, persistence, and offline support for mobile users.

Build a video platform that supports upload, encoding, storage, search, and fast content delivery to viewers.

Design a social feed service that publishes posts, generates personalized timelines, and serves high-read traffic with caching and search.

Build a marketplace platform that supports browsing inventory, placing orders, and processing fulfillment asynchronously.

Build a search service that indexes large data sets, serves low-latency queries, and supports incremental refresh with caching.