I had to go through only 3 interview rounds. 1st interview was a phone screening, 2nd Interview is with the Manager, and 3rd interview is with the Manager and Vice President of the company. When you pass the third interview round you will have to take a mathematical test. They will give you one hour to complete the test . It is best to complete the test sooner than one hour so you can be more of a competitive candidate to receive the job.