Set for life level of wealth (say, $2-3m) is achievable on a programmer's salary or for someone working in finance, and after only a decade or two of work. You just have to save and invest most of your salary instead of spending it all.
Not if you live outside the US.
At the "probably safe FIRE rate", 4% interest: $2m -> $80,000 annually, while also preserving the $2m, accounting for inflation