Sure. But at least at my startup 3 of 5 founders are able programmers, two of five are able mathematicians (important to our R&D process), two of five have extensive strategy and financial consulting experience and one was a manager for a long time.

So... we switch hats a lot. In the last six months I've been (a) deep into research, producing basically Beamer slidesets; (b) implementing that research in Python; (c) spearheaded the basic product design process, albeit based on the whole team's insight (my lemma was "I'm basically an anthropologist trying to make sense of what everyone's been saying", although I made significant calls (d) pitching in with front-end programming in Angular when our third party provider pooped out and it got to crunch time and (e) spent deep time writing finance spreadsheets and valuation models.

It's a tight ship and I'm not even the most multi-talented person in the crew.