Braintree Software Engineer interview questions

They give you an assignment which you have to complete in under a week. The assignment is very simple but they expect you to overly complicate it. The more classes, modules, packages there are the happier they seem to be. I wasted 5 hours on it and got a reject email saying design was not OOPsy enough. The world is moving to functional programming but these guys still seem to be in their own little bloated OOPs world where their tunnel vision restricts them from doing things differently from the way they've always been doing. It's quite frustrating. I would say avoid these guys since they only seem to be interested in wasting people's time.

Completed 3 Rounds of interview 2 technical and 1 HR. I have cleared all rounds but they have taken my documents and third party verification was wrong for my one company.