I already have a stable backend—complete with REST endpoints and live marketplace connectors for Otto and Kaufland—so the missing piece is a polished Flutter-based frontend that runs everywhere: macOS, Windows, the web, and mobile (both iOS and Android). What the UI must do • Real-time inventory tracking tied to the existing API • A sales analytics dashboard with charts, filters and export options • Full product-listing management, including create, edit and bulk operations Design & branding I’ll supply colours, typography and sample screens; please stay consistent with that branding throughout every platform build. Definition of done • One Flutter codebase that compiles and works smoothly on all stated targets • All three feature areas fully wired to the live backend with no critical bugs • Average user interaction latency under 200 ms against the production API • Project delivered as a Git repository with build instructions and runnable release artifacts for each platform If you have ideas for CI/CD or platform-specific optimisations, feel free to include them in your plan.