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Real-world system design case studies from Neo Kim's System Design Newsletter. Each page breaks down how a major platform or technology works — architecture, components, trade-offs, and scale considerations.
19 case studies covering everything from stock exchanges to ChatGPT.

Case Studies

  1. How Stock Exchange Works
  1. How Payment System Works
  1. How YouTube Works
  1. How Google Docs Works
  1. How Kafka Works
  1. How Pastebin Works
  1. How WhatsApp Works
  1. How Airbnb Works
  1. How Spotify Works
  1. How Slack Works
  1. How Reddit Works
  1. How Google Search Works
  1. How Real-Time Leaderboard Works
  1. How Twitter Timeline Works
  1. How Uber Computes ETA
  1. How Amazon Lambda Works
  1. How Amazon S3 Works
  1. How AirTags Work
  1. How ChatGPT Works
Source: Neo Kim — The System Design Newsletter
01 · How Stock Exchange Works02 · How Payment System Works03 · How YouTube Works04 · How Google Docs Works05 · How Kafka Works06 · How Pastebin Works07 · How WhatsApp Works08 · How Airbnb Works09 · How Spotify Works10 · How Slack Works11 · How Reddit Works12 · How Google Search Works13 · How Real-Time Leaderboard Works14 · How Twitter Timeline Works15 · How Uber Computes ETA16 · How AWS Lambda Works17 · How Amazon S3 Works18 · How AirTags Work19 · How ChatGPT Works
System Design Interview Questions
01 · How Stock Exchange Works
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