Hire an App Developer

I need an iPhone/iPad app. I would like it designed and built. I am looking to make an eBay-esque app for buying and selling clothing, shoes, bags, and accessories. Buyers and sellers would be prompted to make a unique profile, and a rating system will be adopted to judge each other after the transaction is completed. As the admin, I would like control over what is allowed to be posted before it goes live on the app. Since this app will focus on name brand designer items only, authentication will be completed before the items are posted by me and other administrators. There will be a drop down list of brands to choose from when posting the items, with the option to write your own brand if it is not already on the drop down and will be pending approval from an administrator. Sellers will be prompted to post photos, condition, and a description of what they are selling. The buyers and sellers will have the opportunity to comment each others posts and message offers as well. Payment would be done through a PayPal processor that takes out a fee from the sale price and sends it to an administrative PayPal account, and sends the gross amount to the seller. If a buyer wants to return something, they will go through PayPal's return service or work things out with the buyer, and once the money is refunded from the seller's account, the fee will be refunded to them as well. If you know of the apps Grailed, Poshmark, Mercari, eBay, and Tradesy- this app will basically take the best and most functional aspects from them and incorporate them into a clean-cut, easy to sift through, and a hand-picked collection of items to choose from instead of random items that just take up space.