Barcode Reader

Small project, counting on a programmer with prior experience on barcodes and barcode readers who has already done something similar (code recycling). FUNCTION OF APP: 1. Log in users (registering all users in database (DB1) 2. Alternative login using Facebook Login 3. Define 1 user as master user (hardcoded) 4. FUNCTION: - Read Product Barcodes and QR Codes (using built-in camera) - Fill database (DB2) with: - product information retrieved through barcode (product type, name, price(?) etc.) - date / time of scanning event - user ID (ID number of logged user) - location (GPS - where is product scanned) - environmental data (temperature, light, signal strength) 5. All information scanned by master user is saved in separate database (DB3) that has same structure as DB2. - No specific requirements on appearance of app - functionality is king. - Database (MySQL) is being hosted online (http://...)