Oh, I have! I spend my days building software for a variety clients, and some happen to be investment banks and hedge funds, so I am still heavily involved with the industry. I am not employed by a fund or bank anymore. I quit my job in finance, not because I was doing badly or making less money, but because it was a terrible use of my time; all I could see was stagnation. It got to a point where I was earning a healthy 6 figure salary for "attending meetings about other meetings". A monkey could have done my job (the only reason a monkey wasn't doing my job is because it couldn't get past the damn finance interview, which is incommensurately harder than the job itself).

When I quit, it took guts, because a job in finance does give you a false sense of comfort and security. But looking back, I was infinitely happier from day one, and am better off than my peers who stayed in their front office roles (this, of course, is not guaranteed and ymmv). I also feel my potential to grow is much more than my past colleagues, who still seem to be trapped in their job's safety net.

Now I'm a passionate engineer and building good products makes me happy, so that's what I do. I have, through my company, launched a couple of private SaaS products, and hope to launch another, more public product soon. I also do a bit of property development in the UK. Whatever time is left over, I use to play tennis or spend time with family. It's great!