I’m no authority but the things that come to mind first are Java, C++, and .net because they are ubiquitous, “old”, well-supported, and it’s not overly difficul

I’m no authority but the things that come to mind first are Java, C++, and .net because they are ubiquitous, “old”, well-supported, and it’s not overly difficult to find a job making brand new things with them.