I would figure out what your technology stack will be, and try your best to get familiar with those languages and frameworks. Then hire someone to build the pr

I would figure out what your technology stack will be, and try your best to get familiar with those languages and frameworks. Then hire someone to build the prototype before YC. You're not going to be able to head the tech side of the company, so it's probably best to find someone to do that as soon as possible as co-founder or a hire. Even if you can't build it yourself, learning a bit about the language and architecture you're using will be valuable.