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Hand-written tutorials, ordered as a recommended learning path.

1. 61 Load Balancer Design a layer 4 and layer 7 load balancer. Covers algorithms, health checks, sticky sessions, TLS termination, and surviving traffic spikes without dropping connections. 5 min read →
2. 62 Message Queue Design a durable message queue like Kafka or Pulsar. Covers partitions, replication, consumer groups, ordering guarantees, and exactly-once semantics in practice. 5 min read →
3. 63 URL Shortener Design a URL shortener like TinyURL or Bit.ly. Covers ID generation, storage, read-heavy scaling, caching, analytics, and tradeoffs you should defend in an interview. 5 min read →