Full Stack Cross-Platform Delivery App

I'm looking for a seasoned full stack developer to create a comprehensive delivery app for both iOS and Android. This app must cater to three user roles: Customers, Delivery Personnel, and Admin. Key Features: - **Tracking System**: An efficient, real-time tracking system for users to monitor deliveries. - **Payment Gateway**: Secure, reliable payment integration for seamless transactions. - **User Profiles**: Customizable, secure user profiles for all three roles. Ideal candidates will have extensive experience in cross-platform app development, and a solid understanding of implementing tracking systems and payment gateways. Prior work on delivery apps will be a significant advantage. Please provide examples of your previous projects.