Write an Android and Iphone application

Hi, Looking for an expert app developer to develop a hotel and restaurant booking app in both android and iphone . App must have a dynamic design and coding to fetch data from the existing database and have UI based on the desktop application existing.. We need the app either in both Native IOS and Native Android or Hybrid app to work on any platform , we will required a detailed specification about which platform will be best or suitable for us. A dedicated , expert and an honest developers is needed or team . Please attached a good documented detail about the development strategy with time and cost along with the specification about both Native or Hybrid platform. Database is ready , UI in the desktop application is also ready .... you need to use that database and UI . **// NO UPFRONT PAYMENTS //** PAYMENT WILL BE DONE UPON COMPLETION OF EACH MODULE AND TESTED BY OUR TEAM. THANKS