Jobs did some programming and soldering logic boards. Gates wrote a BASIC interpreter with Paul Allen. Zuckerberg was in Harvard C.S., I believe, and wrote the first implementation of Facebook himself. Bezos has a B.S. in C.S. and Electrical Engineering. Larry, Sergey, Jerry Yang all Stanford C.S. grad school drop outs.
So, I am having a hard time coming up with a spectacularly successful software company where the founders "just needed a programmer."