Popular Case-Study Articles

This case study explains how to design a high-scale lead lookup system for 200M users, where the main requirement is fast lookup by phone number, email address, or SSN while still supporting contact reassignment and full contact history.

A file storage service allows users to upload, download, organize, and synchronize files across devices. At small scale, files can be written directly to a server's local disk. At large scale, that approach breaks down because application servers are ephemeral, files can be gigabytes in size, storag

A notification system delivers messages to users through channels such as mobile push, email, and SMS. Sending one notification is straightforward. Sending millions reliably becomes a distributed-systems problem involving asynchronous processing, fan-out, user preferences, provider rate limits, retr