Met a representative of the company at a career fair. Followed up with him on Linked In and he invited me for a phone interview. Next I was invited for an on site interview at the offices of the company in Pittsburgh PA. HR called with an oral offer one month later but then hiring manager contacted me saying there was a mistake and they would not move on with my application. Overall I sensed a confusion in the company.

5-6 rounds of purely technical interviews. A lot of graph problems, dfs, bfs and Dijkstra. Also a lot of machine learning questions since the role was related to that. One interviewer asked for merge sort implementation.

All interviews were very pleasant apart from one where the interviewer was speaking very poor English (don't know if it was intentional) and also seemed to be making poor effort to understand me.