Barcode Scanner Integration with Grocery App

I require an experienced app developer who can integrate an external barcode scanner, either gun or desktop type, with my already developed grocery list application, groceryLISS. The scanner should be able to connect to both Android and iOS platforms via both Bluetooth and WiFi. It's crucial that the scanner can be used wirelessly, with no physical connection to the smartphone. Additionally, the selected scanner needs to have a medium range scanning capability of 1-5 meters.

Key competences and experience required for the job include:

- Extensive experience in app development and integration.
- A solid understanding of both Android and iOS platforms.
- Prior work with barcode scanner integrations.
- Understanding of Bluetooth and WiFi connectivity and its application in app development.
- Preferably, previous experience working with grocery or similar retail-focused apps.