Advanced Challenges
for Senior Engineers

Recreate popular OSS dev-tools like Git, Redis, and Docker.
Join top engineers in honing software craftsmanship — in any language.

Start 3-day trial →

Trusted by engineers at top companies with learning budgets

Projects that go
way beyond the basics

Clone your own version of popular devtools, in any language you want to master.

Learn advanced language patterns, discover unique techniques, and master software design ideas that you can bring back to work.

Explore Challenges →

The Redis challenge was extremely fun. I ended up having to read Redis protocol specification doc pretty carefully in its entirety! The result felt like lightly-guided independent study, if that makes sense. (Which, again, was lots of fun)

Charles Guo

Scala Team at Stripe

Grow by looking at
how the experts do it

First do it your way. Then compare with the challenge creators' recommended approach.

It's like pair programming, except you get an experienced partner with infinite energy.

See what you'll learn →

I spent a full day on your Docker building course and ended up building the whole thing myself. As a SRE (and mostly a user of docker), digging into the internals blew me away.

Raghav Dua

SRE at Coinbase

Put your L&D budget
to real good use

The best investment you can make is in yourself.

Our learners use their L&D budgets to invest in CodeCrafters. You get better at writing code, while bringing expertise back into your full-time role.
A win-win for you and your employer.

View pricing plans →

These guys ruined my weekend

Djordje Lukic

Staff Software Engineer at Docker Inc.

Hear it from our members

Engineers at top teams love The CodeCrafters Way™

These guys ruined my weekend

Djordje Lukic

Staff Software Engineer at Docker Inc.

There are few sites I like as much that have a step by step guide. The real-time feedback is so good, it's creepy!

Ananthalakshmi Sankar

Automation Engineer at Apple

I spent a full day on your Docker building course and ended up building the whole thing myself. As a SRE (and mostly a user of docker), digging into the internals blew me away.

Raghav Dua

SRE at Coinbase

The Redis challenge was a great way to procrastinate sleeping for a week! A good change of pace from my regular work, and allowed me to explore some cool tech. I'll be back for more.

Rahul Tarak

Pioneer.app & ODX1 Fellow

Found out from a colleague. It has you build your own version of things like Git and Docker from scratch. A cool way to build a stronger mental model of how those tools work.

Beyang Liu

CTO at SourceGraph

I'm learning about how Redis works under the hood, system calls, socket programming in Python — something I've never done before

Akshata Mohan

Senior Data Scientist at Cloudflare

I've started the Docker challenge, enjoying it a lot so far. Just the right level of guidance, helpful and still gives you a lot of freedom to explore and learn for yourself.