I need a cross-platform application that lets our retail staff, managers, and owners plug in daily or monthly numbers and instantly see profit, loss, and overall cash flow. The same codebase should run smoothly on Windows, macOS, Android, and iOS, with role-based access (employee, manager, owner) and multi-store switching built in. Core workflow • Simple forms for entering sales, expenses, and key employee performance metrics. • Automatic profit / loss calculations on save so no one has to run the math. • Real-time notifications when thresholds are hit (e.g., expenses exceed budget). • One-click summary reports (the level of detail we need) plus scheduled email reports at month-end. • Data export to CSV or Excel for accountants. What I’d like from you • A brief outline of the tech stack you suggest for a single codebase (Flutter, React Native, Electron, or similar) and how you will keep the UX consistent across desktop and mobile. • A plan for secure, cloud-based data storage that can separate multiple stores yet allow the owner to roll everything up. • An idea of how role permissions will be structured so an employee can only view their input while a manager sees store-wide numbers and the owner sees everything. • Suggested improvements or features that would make day-to-day entry even faster—for example, barcode scanning of till reports, receipt photo capture, or POS integrations. Deliverables 1. Functional desktop installers (Windows & macOS) and mobile builds (Android & iOS). 2. Clean, responsive UI with intuitive dashboards. 3. Back-end (API & database) with multi-store support. 4. Role-based authentication and authorization. 5. Automatic summary report generator, export tools, and push/email notification system. 6. Source code with build instructions and minimal user documentation. Once we agree on the approach I’ll supply sample data and any design references you need. Let me know your proposed stack, timeline, and any clarifying questions.