There are two Skype interviews (each about a half hour) where you answer questions regarding your education, your professional experience, and your interest in the role. Also a good time to ask questions about the company and demonstrate your interest. If you pass through those two informal interview rounds, you will be asked to submit a written sample - often a sales plan, or draft campaign email (depending on the role you are up for). The next (and final) step is an in-person interview at the Boston office. This is practically an all-day experience, as multiple individuals from the department you are interviewing for will meet with you for either a half hour or an hour. Excellent chance to ask all your questions, highlight your expertise in the company (and industry), and get to know the people who you will be working with.