I didn't actually go back to school for CS - I had a lot of CS classes in undergrad that gave me some of the OOP theory background, but after that has just been whatever I picked up on the job or to solve a problem on the side.

I also got a bit lucky when I was looking for my first fully-CS job in that my title was "automation engineer," so I was getting interest from recruiters thinking I was a _test_ automation engineer. That opened up the door, after that it was just sweet talking my way in and faking it till I made it, lol.