Experienced developer needed to help build a Marketplace

We are looking for an experienced mobile and web developer to build a marketplace to allow users to buy and sell baby products. The marketplace will allow users to arrange a sale of a product but no payments will be handled by the marketplace. Users will message each other to organize to meet in person or arrange postage to complete the sale. To begin with, the marketplace will be launched in Germany only.

The website and app will be built in German only. Content will be provided in German from English translation so it is not necessary for the developer to understand German.

We require a website and a mobile app for iOS and Android.