If you need to ask them these questions that's an employee, not a cofounder. Maybe it's an employee with a big chunk of equity, but in general you should have a

If you need to ask them these questions that's an employee, not a cofounder. Maybe it's an employee with a big chunk of equity, but in general you should have a pre-existing professional relationship. Otherwise, there aren't enough interview questions in the world to tell you the important stuff.