Pattern series
Probabilistic Data Structures
3 System Design questions share this exact tag. Use the closely related series below for a fuller drill.
- 01Free guide
Tinder
Design Tinder — a location-based dating app with swipe feeds, mutual-match detection, and recommendation of nearby profiles.
Tinder - 02Free guide
Top K Songs (Spotify)
Design Spotify's Top-K most-played songs feature — compute top charts over sliding time windows at listening-event scale.
Spotify / Meta - 03Free guide
Web Crawler
Design a web-scale crawler that politely fetches and indexes billions of pages, deduplicates content, and keeps the corpus fresh.
Google