Thanks! Is there any math I could apply to arrive at that number? Also, since there is so much development left to be done, could I be treated as a co-founder instead that takes salary?
There probably is some certain math, but I don't personally know it. I will say you will be functionally a third cofounder so if your negotation skills are up to snuff then yes you can angle for that. 2nd employee certainly cannot argue for that like you can. Might as well. At the very least take 5% since that is what a bunch of early executives will want and they will be likely building less of the actual tech stack than you.