5. Design a Chat System
Send durable messages, reconnect devices and explain ordering and delivery receipts.
ClassicMedium
Designs
Pick a system. Work through the problem. Compare your approach.
Designs with worked examples 3
Ordered by design numberCompany tags are community-reported. Counts on cards show how many people reported that design.
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6. Design a News Feed
Build a paginated feed that handles high-fan-out authors, fresh posts and visibility changes.
ClassicMedium147. Design Street View Blurring
Blur every face and licence plate in billions of street panoramas: tiles for tiny faces, recall-first detection, a batch pipeline that fails closed.
ClassicMedium