In 1985 I learned and shipped products using IBM Assembler, Cobol, JCL, TSO, and some others not listed.

It was a bit of an unusual mainframe software spinoff company where I did my 1st year and later co-op work placements. My next co-op placement was more conventional embedded C.

Eh, I was pumping out PHP+MySQL and a bit of Python until the early 2010s, when a) I went to work on a larger site where disparate specialized tech was used to optimize every part of it, and b) hipster explosion of devops happened.