I need a cross-platform mobile application delivered for both Android and iOS within roughly four to six weeks. The stack can be either Flutter or React Native, but whichever route you choose must integrate smoothly with a REST-based API layer and rely on Firebase or MySQL on the back end. Core requirements: Email-and-password user authentication Real-time push notifications Clean, intuitive UI/UX that feels truly native on each platform Full deployment support—store listing preparation, signing, and submission Deliverables: Fully functional mobile app Source code in a well-structured repo Build/run instructions Concise technical documentation Evidence of testing (unit and basic UI tests)