Build An Android App like Olx

I want to build an android 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.com. I want to develop an app where user will be able to create account and list his item with photographs and other details. The functionalities will be same as olx app. 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. Able to upload photo and other details to the database 3. Features will be 90% like olx app