First round was more like an overview round about the company, second was purely white board coding and the questions were of leetcode medium difficulty, then some very detailed questions about my projects(I have 4 years of experience in India), then another whiteboarding 45 mins round but I guess he was more interested in how I tackle the question and my thinking process rather than the solution (I completed all the questions he asked though). The questions were related to sessions, threading, concurrency, design problems etc. After this another 45 mins coding test, the interviewer sat next to me and asked me to solve a question from Hacker-rank and wanted me to speak aloud the solution I was thinking. After I solved the first question he asked me to select a question myself but this time he wanted the perfect solution to the question. I did not join as salary was way less than Massachusetts standard plus it was a contract to hire position