First round was short coding test for screening. For Second round we had code pairing, were a thoughtworker sits beside you and we have to discuss with them and code. Basically they review our code and discuss about our coding style. They really expect us to know object oriented programming. Further rounds were technical interview , as I was from a non computer science background(but I knew python language) they tested my logical and reasoning skills . And going further they deeply discussed about my projects that I mentioned in my resume.