I've mostly done small projects for small business. My first project was in High School when I wrote an attendance package that interfaced with card readers..(1) It was originally written in Turbo Pascal and was ported to Delphi when the school admin finally moved to a Windows environment. Had to go back later and add in support for TCP/IP. Since then I've done a number of projects in collaboration with a friend who runs an IT consultancy specialising in Open Source solutions, this has included taking over other, older projects in a variety of languages - so I'm not a master of any language but can generally fix bugs and add new functionality. I've also done some work as a sysadmin..
I don't work in IT as a career any more but do still do some work for my friend, usually on projects I've done for him in the past. I have a friend who currently works for Box, but previously worked for MS and he told me of several trans people he came across while working there, many in quite high level positions - one was a senior dev on the Exchange team.
(1): Yes, I wrote in a backdoor do give myself unlogged access - how else could I skip classes and get away with it.