An apple APP

My project is to develop an apple app for productivity purposes. I have a specific design in mind that I would like the developer to follow when creating the app. Additionally, I have a list of specific features that I would like to be included in the app. The developer will make sure to incorporate all of the specific features that I have requested and ensure that the design layout I have in mind is followed. I am looking for a skilled and experienced developer to work with in order to ensure that this app is effective and meets my specifications. I also need someone who will do the follow up fix in the futur for the app.