The interview process took one month from the time of my application to the time of receiving a job offer. Several rounds, starting with the HR person who evaluates your fit for the position, following the phone screen with the hiring manager, F2F interviews with the team members and additional phone interviews. I was interviewed for the Cambridge site, the future Baxalta biopharmaceutical company, and was surprised with high-quality professionalism and expertise of the interviewing team. The atmosphere is pretty casual, but you really need to understand your field.