Underlying algorithm in auto assignment

Hi, I am very curious to know about the technical aspects of your auto assignment feature. In particular, I want to know about:

What algorithm you use
What kinds of constraints you consider
Limit on the number of employees in auto assignment
Limit on the length of the planning horizon
Approximate computational time to complete the auto assignment (I know it depends on a lot of things, but I would like to get an estimate for, let's say, 10 - 50 employees).