nazakc

I got approached by some people with an internet startup business idea. they have no product, customers or code yet, they want to start by building a website first and they are proposing i lead the front end development in return for a 2.4% equity share. they said they received a 100k in funding, so i guess it's valued at that. i've never been involved in such a thing before, but 2.4% seems little to me. do you think that is a fair share? is there a way to determine what a fair share might be?