First time I see “cool” and “c#” on the same sentence. I’ve always thought stereotype of c# is that is the language for corporate uncool projects.

Just a comment. Cobol nowadays is heavily outsourced. There are jobs but not so lucrative as in the past. Fortran is still strong in scientific computing, but nowadays it is wrapped in python. All that I know who were strong in fortran (me including) are nowadays working with python or scala, most of us on AI related stuff.