Wozniak designed (and built) the Apple I circuit. Jobs was not an engineer, he filled the marketing role.

I believe that is an over-simplification and slightly revisionist take on early Apple history. Jobs was more technical than he is given credit for these days: Atari had employed him as a technician.

However, next to Woz any of us would look like just a marketing guy. Nor would I sugest that anyone but Woz designed the Apple's circuitry.