How many Google employees can access your's Gmail data ?

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At a minimum, they need to be able to comply with subpoenas from the government, so whatever employees process those need to be able to access arbitrary Gmail accounts.

I have also heard that if you work on Gmail within Google, you need to sign a document that says that you will not abuse your privileges, but that even if you do end up seeing anyone's email, you agree to not tell anyone outside of Google about it or even the fact that you were able to see it. 

Also Read: How many Google employees can access your's Gmail data ?

Aside from that I think their processes are pretty solid and generally require approval and proof of necessity in order for normal employees to get to the data.

Thanks and stay blessed!