Challenges
Build your own HTTP server
using TypeScript
Learn about TCP servers, the HTTP protocol and more
completed
Build your own DNS server
using TypeScript
Learn about the DNS protocol, DNS record types and more.
completed
Build your own Claude Code
using JavaScript
Learn about LLM APIs, tool calling, agent loops and more
completed
Build your own Shell
using TypeScript
Learn about parsing shell commands, executing programs and more
50/76
stages
March 2026
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Started the Build your own Claude Code challenge using C
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Completed the Build your own DNS server challenge using TypeScript
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Completed the Build your own HTTP server challenge using TypeScript
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Started the Build your own Shell challenge using TypeScript
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Completed the Build your own Claude Code challenge using JavaScript
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Joined CodeCrafters