Build your own Redis.
In any programming language.
Explain anything with precision.
In any programming language.
Explain anything with precision.
Books can only take you so far. There is no way to understand
a system better than to re-create it from scratch by yourself.
We’ll guide you, but just enough.
a system better than to re-create it from scratch by yourself.
We’ll guide you, but just enough.
Start building your Redis, free →
No Credit Card Required.
Backed by
Y Combinator
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
These guys ruined my weekend
Djordje Lukic (@rumpl)
Full-time Docker contributor
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
Start building your Redis, free →
No Credit Card Required.
Enjoyed by developers at the world’s best companies:
The Staff Engineer’s
Best Kept Secret:
Deep-dive projects.
Best Kept Secret:
Deep-dive projects.
The most effective way to grow as an engineer, is to build high quality projects — either at work, or as a hobby. Projects that beyond just a TODO app.
Successfully creating high quality projects is really hard.
You need to make time. Source ideas. You need to break a large problem down into parts. Read outdated tutorials. Source help when stuck. Get inspiration on ways to improve it.
Unfortunately — for all of us busy developers — all of this extra work means that we will procrastinate starting new projects.
And for those of us that do start, we won’t complete them.
That’s where CodeCrafters comes in.
Useful ideas. Just enough guidance. A community to learn from.
Successfully creating high quality projects is really hard.
You need to make time. Source ideas. You need to break a large problem down into parts. Read outdated tutorials. Source help when stuck. Get inspiration on ways to improve it.
Unfortunately — for all of us busy developers — all of this extra work means that we will procrastinate starting new projects.
And for those of us that do start, we won’t complete them.
That’s where CodeCrafters comes in.
Useful ideas. Just enough guidance. A community to learn from.
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
The Other Secret:
A great circle of influence.
A great circle of influence.
More often than not, a single code problem has many different solutions. The better solutions are not always obvious.
A good engineer can solve a problem. A great engineer knows why the solutions works. A phenomenal engineer goes beyond the basics — they know the elegant approach, they know the other approaches, and their trade-offs. done.
At CodeCrafters, you’re solving a problem, but you’re also taking inspiration from other’s approaches — and constantly expanding your perspective.
A good engineer can solve a problem. A great engineer knows why the solutions works. A phenomenal engineer goes beyond the basics — they know the elegant approach, they know the other approaches, and their trade-offs. done.
At CodeCrafters, you’re solving a problem, but you’re also taking inspiration from other’s approaches — and constantly expanding your perspective.
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
Hear it from our members
Engineers at top teams love The CodeCrafters Way™
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
Start building your Redis, free →
No Credit Card Required.