Myself. Forth it's easy, 9front C it's manageable but POSIX it's hell and managing both Unix descendants are a piece of cake.

GUI interfaces for the enterprise came from Dante's hell themselves. I hate them, they are like the Madhouse from that Asterix movie making satire of the European bureucracy of the day. The often are oddly designed and they are not documented at all, you must guess the meaning by chance of with a senior tutoring you.

The same with anything corporate from Microsoft with AD roles/group policies and the like. Or anything coming from IBM.

lol you guys are being too nice. Building CRUD apps is just implementing business logic by gluing APIs together, there is nothing to understand except the business domain, which is only done through exposure, because business logic is random. And then the APIs which are all essentially a kludge because of the shifting business logic.

Understanding low level code puts you on entirely different level because you can reason about a problem using logic and how systems operate.

No disrespect to any crud devs here but from my personal experience they just know a particular implementation of their domain and rarely even consider how the code base even operates as a whole