Overall a negative experience because I never got the courtesy of a follow-up after 2 phone interviews and 4 hours onsite. There was one 30-minute phone interview with HR, then a 60-minute phone interview with the hiring manager. All seemed excited to get me started. Went onsite in Waltham for a 4-hour interview with several team members. Thought it went well but never got the courtesy of a follow-up afterwards. Disappointing.