Well, this is not necessarily a bad thing. If it was approachable by a non-IT person in HR, and business rules could be updated without contacting IT and waiting, then more power to them. I have seen this sort of thing developed as a coping mechanism because the official IT team could not be used, either due to time, cost, priority, or whatever. Also, even being in IT, 1 multi thousand line file can be a lot more manageable to work in vs. a dozens of smaller files where it's not clear where to look without being in an IDE.