DJ

Challenges

Build your own HTTP server

using C#

Learn about TCP servers, the HTTP protocol and more

completed

Build your own Claude Code

using Python

Learn about LLM APIs, tool calling, agent loops and more

completed

Build your own SQLite

using TypeScript

Learn about SQL syntax, SQLite's file format, B-trees and more

completed

Build your own Git

using Java

Learn about git objects, plumbing commands and more

completed

Build your own Interpreter

using Python

Learn about tokenization, ASTs, tree-walk interpreters and more.

completed

Build your own Redis

using C# and Python

Learn about TCP servers, the Redis protocol and more

completed

Build your own grep

using TypeScript

Learn about regex syntax: character classes, quantifiers and more

15/33 stages

Build your own Shell

using C++

Learn about parsing shell commands, executing programs and more

50/59 stages

• Completed the Build your own Redis challenge using Python

• Completed the Build your own Redis challenge using C#

• Completed the Build your own Claude Code challenge using Python

• Started the Build your own grep challenge using TypeScript

• Completed the Build your own Interpreter challenge using Python

• Completed the Build your own SQLite challenge using TypeScript

• Completed the Build your own HTTP server challenge using C#

• Completed the Build your own Git challenge using Java

• Started the Build your own Shell challenge using C++

• Joined CodeCrafters