In 2007 I joined a company that sold a derivatives trading platform and ran VMS on the core component, the order routing engine that dispatched trading instruct

In 2007 I joined a company that sold a derivatives trading platform and ran VMS on the core component, the order routing engine that dispatched trading instructions to the respective exchange. It was really weird working on it at first after having used both Unix systems and DOS for so long. I was very familiar with DOS and even used CP/M way back in the day when I was a teenager (I'm that old), VMS was a weird amalgam of a pretty advanced OS with a very capable command line environment like unix, but with a lot of conventions that felt familiar from DOS. I was a ware of some of the history of VMS influence on DOS so it was fascinating to work on and I quite enjoyed it even though it was clearly a dead end at that point.