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“
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
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I spent a full day on your Docker building course and ended up building the whole thing myself. As a SRE (and mostly a user of docker), digging into the internals blew me away.
Raghav Dua
SRE at Coinbase
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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
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The instant feedback right there in the git push is really cool. Didn't even know that was possible!
Patrick Burris
Senior Software Developer at CenturyLink
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Found out from a colleague. It has you build your own version of things like Git and Docker from scratch. A cool way to build a stronger mental model of how those tools work.
Beyang Liu
CTO at SourceGraph
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The Docker challenge helped me dive into its internals, through *actual* practice. Super fun.
Kang Ming Tay
Software Engineer at Supabase
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These guys ruined my weekend
Djordje Lukic (@rumpl)
Full-time Docker contributor
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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
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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
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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
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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
$35k winner of HackAtom
“
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
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