Need advise on equity

Hey all, I am in the late stages of launching an app (Cloud native, API and AI based) with 3rd party data integration. We don’t have any user/revenue at this time but the base platform is almost ready with some user feedback. So far I have been the only one tackling the technical aspects (with some external help) and other non-technical aspects. Now I am teaming up with another partner who is going to be my technical co-founder who ideally will help in taking my platform forward and tweak the product depending on further user feedback. I am wondering what should be the equity offering to the co-founder in this situation considering that the product is in slightly late stage but also considering the skills required for this and also potential pivots we might have to do in future.