The process took around 5 weeks. It contained 4 rounds in total. First round was a VC with a senior data scientist and questions were mostly around the cv and few about business understanding of GroupOn. Followed by a second round by another data scientist. It was mostly technical round and were questions were on Machine Learning. Third round was VC with live coding test. This was the round where could I performed little. Even then I recieved call for a final round which is face to face at London GroupOn office. Last round was mostly a managerial round. After completion of rounds, I had to wait for around 20 days for the final result. And after which I received a mail stating that they found an other suitable candidate for the role.