If there is a system out there that allows staff to sign on and sign off using biometrics like fingerprints?

Hi v-wong, 

QuickBooks Online (QBO) integrates with different kinds of a third-party application. You can search for an app that includes a bio-metrics feature in our App center. Let me guide you how.

1. Click Apps in the left menu.
2. Go to the Find Apps tab.
3. In the search field, search for the app.

Another way to search for an app is to go to this link: https://apps.intuit.com/app/apps/home.

I have this Help Articles in case you have other questions about QBO.

Please get back to me if you have any other concerns. I'm always here to help.

why do you need this feature and how do you want to implement that with QBO?