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Search - "wk99"
Writing customer passwords fulltext into the prod database because "it's easier to associate them with the user"5
The worst thing I've seen a developer do would be becoming a university teacher while not being able to understand simple OOP or good programming practices.
I can't think of a most harmful one, just mediocrity cultivating unknowingly mediocre devs.2
Once upon a time i have seen a block of code in a while (2 > 1) ... it was in C (or so i remember), but still...2