4 steps, online application, 5 minute phone interview to basically confirm that i meet the minimum qualifications of the job, followed by 20 min phone interview with hiring manager to give basic details about why I would be a good fit for the position, and final hour long on site interview in Cambridge. The final interview was very casual and the managers seemed more interested in getting to know me then actually assessing my skills for the position at this point. This was followed by a short tour of the facility.