Android & iOS App with Backend UI

Our company is looking for an Mobile App like below 1. [login to view URL] Just download the app & see what we want. There will be some changes required like Logo, Color, Layout, we do not need to mention stores names, we want when someone click the product image, it will enhance or zoom, & complete re-branding. App must be compatible to all Android versions & iOS with a common backend. Time to complete: 20 days in perfect working condition with smooth Back-End. Back-End must be easy to use, must be multi-login user, product upload feature must be easy, excel upload & bulk images upload. Kindly Bid only if you do it within time period.