Buy and sell used items apps such as offerup

I need to create a professional local app for buy and sell used items such as offerup. The app muse be designed professionally and working perfectly also with all the functions with some extra features such as the in app calling I need to hire someone experienced with this kind of apps and I prefer to see a sample for previous apps. The app I need for both android and IOS. I want the app work only in Iraq for now, maybe later will add other countries This is another example also for what I need [login to view URL]