Staging CareerSites in Google Results

Looking for suggestions on how to avoid our staging career sites from showing up in Google results. We are not seeing much external traffic to our staging site, but it is a concern from our Branding team. We have reached out to Oracle who said we needed to get in contact with Google. The Google documentation to delist a site does not seem applicable to the Taleo career site pages.

Does anyone have any experience with this or can provide a suggestion?

Thank you