Full time UX/UI designer for community based app

We have designed and developed a community based native app for entrepreneurs. To further develop our app we are looking to hire a full time UX/UI designer who can work together with our developer. We are a company based in Europe. Therefore we would appreciate a designer who has experience with European/American customers. We are looking for somebody who can work 40 hours a week for us for the coming 6 months at least and most likely for a longer period.