I run a local dairy service and need a single application that works on iOS, Android, and the web to handle all of our billing. The core of the project is automatic invoice generation: once I record a customer’s daily milk delivery, the system should compile those entries into a neat, shareable invoice without additional input from me. A PDF that can be emailed or downloaded directly from the user’s device would be ideal. Although customer management and payment-gateway features may be added later, right now the priority is clean, accurate invoicing that updates in real time across every platform. Please build with a shared codebase (React Native, Flutter, or another cross-platform framework you prefer) and include an admin web dashboard where I can: • enter or import delivery data • view, edit, and approve invoices • trigger individual or batch invoice sends Deliverables • iOS app, Android app, and responsive web dashboard all pointing to the same database • source code and clear setup documentation • a short walk-through video or live demo link so I can see the workflow end to end Once the automatic invoicing is solid, I’d like the option to extend the project, so structure the code with future add-ons in mind.