Shore answer, yes.
Are you a co-founder or an employee? Everyone's first job is to sell. So yes to recruiting, yes to pitching, yes to recruiting, yes to researching the market, yes to roadmaps. And in reverse, your biz co-founder should be helping you get the correct development tool licenses, supply you with photoshop designs, get hosting deals, etc. Think about deciding what cloud hosting you're going to use? This isn't about just technology because this decision shapes your COGS.
Quick Anecdote: When Google was hiring their first vp of marketing, the interviews were attended by their original vp of engineering. When the vp of marketing was hired the vp of engineering insisted that he split an office with marketing. This allowed for frequent communications between the two and gave them an advantage when creating products. Google's products were always a combo of engineering and marketing.