Design a URL Shortener

Each one worked end to end: requirements, estimates, the first diagram, the bottleneck that appears at scale, and the two or three deep dives an interviewer will push you into.

This module is 07.1 of the 6 in Design Case Studies. It runs about 3 hours across 5 lessons, and closes with Shorten — Serve 50,000 redirects a second on a budget, then add analytics without touching the p99.