System design problems

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.

Build an AI knowledge assistant that ingests documents, retrieves relevant context, and generates grounded answers for users.

Design a notification platform that fans out product events to push, email, or SMS channels with retries and user preferences.

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.

Build a metrics pipeline that ingests high-volume events, aggregates time-series data, and powers operational dashboards and alerts.

Design a payment and ledger system that authorizes payments, records immutable financial movements, reconciles providers, and supports audited operations.

Design a ride-sharing dispatch system that matches riders with nearby drivers, tracks trips in real time, and handles pricing, acceptance, and cancellation events.

Design a collaborative editor where multiple users edit documents together with realtime updates, offline sync, version history, and conflict handling.