Informatica Software Engineer QA interview questions

I talked to Informatica at my college's job fair. A few week later I was asked to do a coding challenge on Hackerrank. They were 3 easy technical problems as a basic screening. About 3 weeks later they responded to schedule a phone+googledoc interview with a QA manager. The interviewer was extremely difficult to understand and did a bad job explaining the problem. Although I tried my best to extract exactly what was being asked, I misunderstood a simple problem as a something else and wasted an incredible amount of time trying to solve the wrong thing.