Develop a Mac Application

We need to build an Apple TV app for a Magazine, the app have to be able to have different categories in each category we will have articles and this articles will have content to be read, an image gallery with a presentation option and a youtube video. We are planing have in-app purchases where the buyer can have access to a sound file where a voice artist will read the article while the image gallery is played. We have a very limited budget for the first version of the app, but we plan to make it grow in the future with an commerce in it so we plan to work with the developer for a long time. Thank you. Happy bidding.