Build your own Git, BitTorrent, SQLite from scratch - in Rust, Go, JS, etc. Develop robust CS fundamentals. Refine your programming judgement & taste.
San Francisco
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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.
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CodeCrafters retweeted
An extraordinary day.
Our repo is #1 on GitHub by stars.
And the first-ever to hit 500k.
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Introducing our new website.
Build something you didn't think you could.
codecrafters.io
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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?
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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.
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Today we're announcing to give $4,000/yr/engineer to the open source projects we depend on.
codecrafters.io/blog/oss-ple…
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IIT BHU, welcome to the party.
We're making CodeCrafters free for all @IITBHU_Varanasi students, staff and alumni.
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You're invited to the underground coding club, UC Berkeley.
CodeCrafters is now free for all @UCBerkeley students, alum, and staff.
codecrafters.io/berkeley
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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.
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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
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CodeCrafters retweeted
This repository is a compilation of well-written, step-by-step guides for re-creating our favorite technologies from scratch.
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CodeCrafters retweeted
Codecrafters wants to challenge seasoned developers with hard-to-build projects tcrn.ch/49ekcXn
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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: nitter.net/i/spaces/1OdJrXBVyeyKX
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Join us in our first ever X Spaces session. We're hosting @JoeAverbukh & @stopachka , the founders of @instant_db.
Set a reminder here: nitter.net/i/spaces/1OdJrXBVyeyKX
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Today we're sharing news about our $1.8M seed fundraise.
codecrafters.io/blog/seed
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Today, we're joining @getsentry, @convex and others, in going Fair Source.
codecrafters.io/blog/fair-so…
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Today, we’re announcing our latest challenge: Build your own Interpreter.
app.codecrafters.io/courses/…
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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.
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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.
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