I've also been through Epitech which is the school that greatly inspired 42 (same founders) and I would like to add some details on top of that.
Even if it's true that Epitech us mainly about coding, the program enforce a coding standard that is a huge part of the final grade of each coding project (small functions, 80 char per line of code...). Fom the second year, components decoupling and basic design patterns are part of the program.
Nevertheless, the school doesn't really make the most to teach basic good engineering practices or at least I don't remember (doc, tests, vendoring, observability...) and this is one of the main pain point.