> you just start working with a guy, giving him basic isolated tasks, and as he successfully progresses with his work, task are getting more and more complicated (salary, permissions as well). After few months of such freelance-ish work you can know for sure that this dude is compatible with the team, able to solve problems, able to learn. And only then he becomes an employee with offer, benefits and SO.

Careful not to presume or disseminate the idea that all candidates/hires are men.