I need a technical co-founder to build a platform and I don't know any developer, what can I do ? 1- Search for one ? Any recommendation for the steps to make

I need a technical co-founder to build a platform and I don't know any developer, what can I do ? 1- Search for one ? Any recommendation for the steps to make in order to find the right man ? 2- Or ask a web/mobile development company to build the platform ? What do you think are the +/- of this case ?