"finance tech" -- those people maintaining those systems are middle-aged, comfortable, and well-paid. If you were junior under them, you would never want to stay. Fifteen years ago, there were large fresh hire classes each year. Tons of juniors around the office. Plenty of young ones dreaming up unnecessary "upgrades". Most of that is gone as the industry has matured. If anything, the hoards of junior hires have moved from finance to Big Tech.