Flutter App

Hello dude, we are searching for a cross-platform developer for our project, which will be a marketplace like an app. We are searching for somebody able to develop and implement the following tools: - Integration with a NoSQL DB (MongoDB, Firestore); - Integration with Google Maps; - Integration with payment systems; - Integration with authentication systems (Firebase?); - Chat systems; - Eventually an integrated navigation system; The user interface must be minimal, modern and fresh, with some basics but great-looking animations. Our application should have around 15 pages, which we have sketched on paper with flow and components description. Do you convert sketched UI into an application? Additionally, our app must be GDPR compliant. Can you please provide us with your portfolio and a quote with all those functionalities? Regards