Extraordinary projects.
For extraordinary people.

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Y Combinator

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

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

My favorite way to master a language.

Pranjal Paliwal

Winner of HackAtom

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

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

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

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

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

Enjoyed by developers at the world’s best companies:

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Extraordinary projects. For extraordinary people.

Extraordinary projects.
For extraordinary people.