Build An Android and IOS App for Classified website platform like olx and quikr

I want to build an android and IOS app that will allow my users to post the product they want to sell or rent out to any one, any one that wants to buy or rent a product will be able to see the closest seller or rental, which is based on the same model as olx and quikr, also search jobs and services and post job and services. I want to develop an app where user will be able to create account and list his item with photographs and other details also in bulk. show location options all. I am looking for the experienced developers. Development of graphic design and UI elements: I need them created as part of this job. Top app requirements: 1. buyers or rentee will be able to see a little map showing the location of the person who posted the product 2. 100% features of OLX app and also full featured admin panel