English version: https://github.com/datascale-ai/data_engineering_book/blob/m...
I hope xx123122 won't mind my mentioning that they emailed us about this post, which originally got caught in a spam filter. I invited them to post a comment giving the background to the project but they probably haven't seen my reply yet. Hopefully soon, given that the post struck a chord!
Edit: they did, and I've moved that post to the toptext.