Don't look for a cofounder by stating the technical requirements -- that sounds like a job posting. If you want your technical founders to feel vested in the company, they'd prefer to hear what the company is aiming to do.
I don't think I've posted a job posting. I'm still being very broad in description. But I'm looking for a co-founder who is more experienced in backend technologies. I'm not looking for passionate startup person who is great in design, and have no experience in backend. I'm trying to compensate my skills.
About what the company is aiming to do - I can't write all the details openly and with everybody. My approach is to discuss the details with the right set of people - on one and one basis. Once someone shows any interest, then I'll discuss the details with him.
