Google Calendar API Integration

We are looking for an experienced freelancer to help develop a mobile-optimized web solution with the following requirements:

Project Scope:
• Develop a mobile-friendly web page (responsive design, optimized for smartphones)
• Integrate Google Calendar API
• Read and write calendar events
• Sync booking / scheduling data with Google Calendar
• Implement barcode / QR code scanning feature using mobile device camera
• Scan code via mobile browser
• Process scanned data and trigger related actions (e.g. booking check-in, validation, or record lookup)
• Basic backend integration (API handling, data processing)
• Clean, well-documented code