He probably saved a lot of money from his days of being a "well-paid" developer and has since lived off that.
At the time, I hadn't yet begun medical school but knew it probably wasn't going to pan out for me (it didn't thank god!). Instead, I became a union electrician and worked in data centers for several years, then began my own residential service (would not recommend the latter; homeowners are in aggregate not-ideal customers).
I'm currently in no hurry to figure out "what next," other than for reasons of ongoing sanity. For two years I was primarily an electrical inspector, but it gets really exhausting when nobody ever reads your inspection report until pending litigation... so who knows; thankfully my savings allow me to be in no immediate rush/concern.
tl;dr: selling hamburgers sounds nice (although not sure on the financial$-aspect).
He now sells hamburgers and hotdogs at festivals. He only works in the summer months (when the festivals are held) and enjoys life the other half of the year.
I envy him greatly.