Only Bid - expert in eBay REST api

I'd like to find an expert for using eBay Rest API. -Get sold items. -Get details of each sold products. -Upload item to eBay to after changing the photo or some other details. I need to make a mobile app with the above features using eBay API. So you need to be able to provide backend API for the mobile app. Please start proposal with "Have experiences in eBay API." if you have experience already.