Actually what it would be useful to you is a Product Owner, or Technical Producto Owner to help you design your MVP (Minimum Valuable Product).

The MVP would be the first iteration of your project, and it would help you validate your hypothesis about the value and market of your product.

A developer is a good profile for this job, but at least with 5-7 years with experience in mobile apps and web apps.

I also recommend coaching with some CTO of a similar company or somebody who has been a succesful CTO for ask her or his opinion.