Everyone's going to advise leading-edge technology options. Consider the other extreme: long-established businesses are desperate for developers capable of wor

Everyone's going to advise leading-edge technology options. Consider the other extreme: long-established businesses are desperate for developers capable of working on old systems like COBOL, 370 Assembler, etc. His "tons of experience" mean he is familiar with old-school tools & mindset, things which new developers can't fathom in a world of smartphones & clouds. Such developers made a pile of money 15 years ago when a burst of manpower was needed to solve the then-looming "Y2K bug"; those talents are still very much in demand, and there's a lot fewer developers able & willing to work on those systems. Mainframe developers are still needed. Society isn't creating any more of them. Supply + demand = write your own check in this niche, so long as you'll work on anything anywhere.