Why I can’t find a good app developer in town?

I received my Ph.D. in English Literature from Oxford. Since then, I've taught at prestigious universities all over the country. I enjoy reading and writing, and I recently came across an idea for an app that could help writers become more productive. Someone advised me to hire custom mobile app development services in the USA when I was looking for app developers. However, I really need some additional recommendations and would appreciate your assistance in locating the best app developer.