I reached out on a job board and got a response. I week later I had a chat with someone and they decided to move to the technical interview with me. At first it was supposed to be on-site but then it was changed to zoom. We had the technical a week later. It was about moderate difficulty. However it was odd; every time I began to talk out loud about what I was thinking the interviewer would interrupt me and jump several steps ahead which didn't allow me to come up with even the first step of a solution. A week later I received an email that said they went ahead with someone else.

I went there through an employee referral. First interview was telephonic with HR. It was overall nice and very informative. She explained the business model and what the company does. She discussed about my background and some general information. She mentioned there might be two technical round (telephonic) and depending on that they will proceed further. First technical (telephonic) interview was overall good and he said he is going to share his feedback with the hiring manager. He sounded very nice and talented. I was invited for a face to face interview in their Franklin, MA office. I had four rounds of interviews with different people (including the one who took my telephonic interview) followed by HR. I technical interview I was given a concurrency problem and was asked to design and write the solution in Java (Java 7 or Java 8). Interviewer were very friendly, and smart. Overall a good experience. If you did not work in concurrency recently and take extra time to prepare for interview and do some hands on before attempting such interview.