What is your role here? Are you a manager looking to extend his team? Or someone from HR? Or a developer looking for a partner? Do you have your own office? It would help to clarify these matters, because tips may vary.

For instance if you work closely with people, then you definitely get a feeling for their productivity. If you’re not technical, you don’t have access to the source code repository. If you don’t have your own office, you can’t check people coming in on camera. That sort of stuff.