Dev Access without Personal Access?

I have a developer account which is connected to my Personal Apple ID. I have a developer building me an App and I want to give him access to the developer account without giving him access to the personal account. How do I do this?

This is the only page I found, https://developer.apple.com/programs/roles/index.php which seems to suggest that either way, I am the one, as Team Agent, who is going to be submitting apps to the app store. I plan on delegating this task.

Thanks!