We didn't even have any version control. Everybody was logged in, editing the same files over ftp, and reloaded the code on the running instance. It was chaotic and hilarious. I eventually ended up in charge of the "mudlib" (essentially the standard library). I learned so much from reading, debugging and trying to improve that code and, eventually, being a sort of mentor to a slightly younger batch of newbies.
I've never been a guru when it comes to clever algorithms, and I'm pretty shit at math, so I've had to find some other role fit on a team. I believe my main strength to this day is debugging weird and messy code, and much of the reason for that is the years I spent trying to get that wonderful mess of a code base to work.