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DSA & System Design
All modules
System Design
HLD path
Deep dives
Questions
Playground
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The basics
What is a cache, a shard, a queue? One picture and one minute each.
CS fundamentals
Locks, TCP and TLS, indexes and transactions.
Low-level design
Classes, SOLID and design patterns, with exercises.
Architecture lab
Grow one system from a single server, then spike the traffic.
Cheatsheet
Latencies, sizes and formulas.
Glossary
Every term on the site, one line each.
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Shorts
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