Have you nailed down: 1. A product market fit? 2. Accessibility channels? 3. Monetization strategy? 4. Competitive Advantage?

UX & marketing are pieces of the puzzle but not the whole pie. If you have all the pieces ready above then I think you are ready to engage a developer /co-founder.

In my experience with dating (speeddate.com) it is a lucrative business but a very shady one depending on what line of the fence you sit on. Approach with care.

Cheers.