app developer

I am looking for an experienced app developer to help me bring my idea to life. The app must be developed for both iOS and Android platforms. The purpose of the app is to provide a monitoring service for a specific activity. I have a general idea in mind for the design and branding, but am open to suggestions from the developer to ensure the best end product. The successful applicant must be able to provide a polished, professional end product that meets my expectations and requirements.