Become a better
software engineer.

Stop following tutorials designed for beginners.
Start working on projects that actually challenge you.
Become a better engineer through deliberate practice.

Pick a challenge →

See the 2m demo

Enjoyed by developers at the world’s best companies:

Backed by incredible engineers

These fine folks believe in the CodeCrafters approach.

Mike Krieger

Co-founder/CTO, Instagram

Arash Ferdowsi

Co-founder/CTO, Dropbox

JJ Kasper

Maintainer of Next.js

Jitendra Vaidya

Co-founder, PlanetScale

Paul Copplestone

Co-Founder, Supabase

Hear it from our members

Engineers at top teams love The CodeCrafters Way™

These guys ruined my weekend

Djordje Lukic (@rumpl)

Full-time Docker contributor

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 course and ended up building the whole thing myself. As a SRE (and mostly a user of SQLite), 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

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

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

My favorite way to master a language.

Pranjal Paliwal

Winner of HackAtom

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

Cindy Wu

Participant at Recurse Center

In a perfect world, job interviews ask for assignments like CodeCrafters instead of Leetcode. The best way to refresh your programming language skills and learn something new about Redis, Git, SQLite internals.

Vladislav Ten

Software Engineer at Microsoft

The challenge helped me dive into its internals, through *actual* practice. Super fun.

Kang Ming Tay

Software Engineer at Supabase

I was really impressed that they support Haskell, and will probably usethis to learn Rust! The git-based workflow is :chefkiss:

Jonathan Lorimer

Lead SWE at Mercury Bank

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

Beyang Liu

CTO at SourceGraph

Try Now →

Projects that go way
beyond the basics

Challenge yourself beyond implementing CRUD features. Build something that actually stimulates you.

Recreate timeless software from scratch. Strengthen your fundamentals. Master your languages.

Become a confident developer.

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

Be in the company of
prolific developers

Is there a more idiomatic approach? Or a concise one?

Study how other engineers approach the same problems.

Develop a circle of influence you can’t find at work.

Charles Guo

Scala Team at Stripe

Use your favourite
tools to code. No limits.

Don't be limited by web-based editors.

Code in your usual IDE, with your preferred customisations. Push code with Git and get instant feedback. Share your work on GitHub.

CodeCrafters is designed for pros.