Abundance of business logic in the code. I thought the programming job was about writing code, but on my first project I often would be given task like "when A, B and C are true, X processed by Y returns Z, and it should return Z - 5". I would spent the next four hours learning what A, B and C are and what Y does to X, then I would write a few lines of code (which in turn would break another logic, no tests for devs!). Now I understand that this was due to bad architecture, but then I was puzzled.
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