Jobs did work for Atari, and they trusted him enough to do design circuit boards so IMO he was probably a competent electrical engineer. However, he did use Wozniak who was ridiculously good at circuit design so he could focus on other things. Still IMO, that's like having Einstein help with your math homework if it's an option you take it.
I think that Jeff Bezos is more Jobs than Zuckerberg is, but who knows.