Cross-Platform Mobile App for Order Notification

I'm seeking a developer to create a simple, cross-compatible mobile app for both Android and iOS. This app will serve as a modern-day vibrating disk used in restaurants to notify customers when their orders are ready for pickup.

Key Features:
- The app should be able to receive push notifications from a server.
- When a notification is received, the app will start to vibrate and sound.
- Users will trigger the app by scanning a QR Code or using NFC.
- If the app is not installed, the QR Code will redirect to an instructional webpage.
- Upon opening the app, a web call is sent to an API with the scanned QR Code information.
- The app binds the user with the code tied to their order.

Ideal Skills:
- Experience in developing cross-platform mobile applications.
- Proficiency in implementing push notifications.
- Familiarity with QR Code and NFC integration.
- Knowledgeable in API interaction.

Please note, the purpose of the app is to notify users (via sound and vibration) when their order is ready for pickup. Therefore, understanding of how to create engaging and effective push notifications is crucial.