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build real systems from scratch, or sharpen your tools.
Build an HTTP server from raw TCP sockets. No frameworks, no libraries - just you and the protocol specification. Understand exactly what happens when browsers talk to servers.
Process 1 billion temperature measurements as fast as possible. Start with a working solution, then systematically optimize - I/O, parallelism, parsing, data structures - until you're competing with the best.
Understand DNS from the ground up by building a recursive resolver. Parse binary protocols, query root servers, follow delegation chains, and implement caching.
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