I need a complete Android & iOS marketplace developed from the ground up, inspired by platforms such as Wallapop or Vinted. Users will register and log in exclusively with their phone number; the flow must include SMS verification and the usual protections against account fraud and duplicate numbers... (Budget: €1500 - €3000 EUR, Jobs: Android, Flutter, iOS Development, iPhone, Kotlin, Mobile App Development, Next.js, Node.js, PHP, React Native)