I need a poster-making application that runs smoothly on both iOS and Android and helps users create general-purpose posters with a polished, professional look. The experience should feel intuitive from the first tap: choose a template from the design which admin uploaded or start with a blank canvas, add or replace images, edit text on the fly, and finish with a high-resolution export suitable for social sharing or print. A clean, modern UI is essential—think crisp typography, easy color selection, drag-and-drop element positioning, and live previews that update instantly. Performance matters just as much as aesthetics, so the app should stay responsive even on mid-range devices. Deliverables • Complete source code with build instructions • One TestFlight build and one signed APK for QA • User guide covering all key features • Two weeks of post-launch bug support Acceptance criteria: the app installs on current iOS and Android versions, exports at least A3-size posters at 300 dpi, and every editing action responds within one second. Cross-platform frameworks such as Flutter or React Native are welcome as long as App Store and Google Play submission is included.