Challenges

Build your own Shell

using Python

Learn about parsing shell commands, executing programs and more

50/76 stages

Build your own Claude Code

using Python

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

2/6 stages

Build your own Redis

using Java

Learn about TCP servers, the Redis protocol and more

44/115 stages

Build your own DNS server

using Java

Learn about the DNS protocol, DNS record types and more.

2/8 stages

• Started the Build your own DNS server challenge using Java

• Started the Build your own Redis challenge using Java

• Started the Build your own Claude Code challenge using Python

• Started the Build your own Shell challenge using Python

• Joined CodeCrafters