Build your own Git, BitTorrent, SQLite from scratch - in Rust, Go, JS, etc. Develop robust CS fundamentals. Refine your programming judgement & taste.
San Francisco
Joined February 2020
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Could you build Claude Code yourself?
We’re betting you can.
Introducing our newest challenge: Build Your Own Claude Code
app.codecrafters.io/courses/…
You’ve been treating AI agents like a black box. It’s time to crack the box open. Build a working coding agent step-by-step and discover what’s generally under the hood.
CodeCrafters retweeted
An extraordinary day.
Our repo is #1 on GitHub by stars.
And the first-ever to hit 500k.
Introducing our new website.
Build something you didn't think you could.
codecrafters.io
Is your coding agent really smart or did it just memorize the test answers?
Today we're launching CCBench, a benchmark for evaluating coding agents on small-scale codebases (<10k LoC) that aren't part of LLM training data.
It's designed to answer a simple question: How well do agents perform on tasks that aren't part of public training data?
ccbench.org/
Does your favourite agent top the rankings?
This challenge is still in beta. So it's free to try!
It's live in 5 languages currently. Support for more languages coming soon.
Today we're announcing to give $4,000/yr/engineer to the open source projects we depend on.
codecrafters.io/blog/oss-ple…
CodeCrafters retweeted
Here’s a master list of ideas
github.com/codecrafters-io/b…
CodeCrafters retweeted
IIT BHU, welcome to the party.
We're making CodeCrafters free for all @IITBHU_Varanasi students, staff and alumni.
You're invited to the underground coding club, UC Berkeley.
CodeCrafters is now free for all @UCBerkeley students, alum, and staff.
codecrafters.io/berkeley
CodeCrafters retweeted
We finally got into IIT.
Today we're announcing our partnership with @iitroorkee to make CodeCrafters free for its students, staff and alumni.
codecrafters.io/iitr
Silicon Valley's favourite challenges.
Now at IIT Roorkee.
Today we're making CodeCrafters free for students, staff, and alumni of @NUSingapore.
Silicon Valley's favorite coding challenges. Now making its way through Singapore.
codecrafters.io/nus
CodeCrafters retweeted
This repository is a compilation of well-written, step-by-step guides for re-creating our favorite technologies from scratch.
CodeCrafters retweeted
Codecrafters wants to challenge seasoned developers with hard-to-build projects tcrn.ch/49ekcXn
Tune in tomorrow for a Q&A with Joe & Stepan, the founders of @instant_db
Instant is a modern Firebase that makes you productive by giving your front end an easy, real-time database. It is backed by Paul Graham, Greg Brockman, Amjad Masad and many more.
Set a reminder here to speak with Joe & Stepan: xitter.cf/i/spaces/1OdJrXBVyeyKX
Join us in our first ever X Spaces session. We're hosting @JoeAverbukh & @stopachka , the founders of @instant_db.
Set a reminder here: xitter.cf/i/spaces/1OdJrXBVyeyKX
Today we're sharing news about our $1.8M seed fundraise.
codecrafters.io/blog/seed
Today, we're joining @getsentry, @convex and others, in going Fair Source.
codecrafters.io/blog/fair-so…
Today, we’re announcing our latest challenge: Build your own Interpreter.
app.codecrafters.io/courses/…
Ultimately, you’ll discover how programming languages work and how code is executed, at a fundamental level.
Get started here:
app.codecrafters.io/courses/…
The challenge is completely free while in beta.
For 10 lucky winners, we're giving away a free copy of the physical book. amazon.com/dp/0990582930
RT the main tweet and start the challenge to become eligible.
