Barcode on Mobile - can this also be a QR code?
Yes.
Can anyone scan a bar/QR code?
Anyone can scan a QR code to see the detail of the equipment.
However to log a ticket /job against the equipment you would need to log into Service geeni.
Can you allow an employee (who is not an SG user) to scan a bar/QR code to log a ticket in Service Geeni?
No, scanning a barcode must be done through the mobile app.
The Web Portal lets you log a ticket but doesn't have barcode scanning functionality.