I went through a mainframe cobol bootcamp at a company in the 90's and worked on their code for a few years. The thing to know today is most all the jobs (in th

I went through a mainframe cobol bootcamp at a company in the 90's and worked on their code for a few years. The thing to know today is most all the jobs (in the US) were offshored, very few of those jobs are left in the US today. The other thing to know is; it's really hard to learn if you don't have access to one (obviously). They are from an era when computing was not ubiquitous, there is a whole parallel universe of computing in mainframes where things have different names and conventions, while the basic concepts are the same. It can be very hard to translate. For me, my time on mainframes was enlightening and interesting, but a major career dead end. I had to go back to entry level in a different stack to get out of it. Glad I did, those jobs are all dead end, miserable, cost centers. Every company who has mainframe applications would love to get off them, but they can't because the cost is too high.