Only had one round of interviews with the person in charge of hiring the interns. She happened to work in the department that I applied for, but she interviews every single potential intern. It was a 30-minute interview with basic questions. I felt like I answered everything well and had a ton of relevant experience, but didn't get the internship. For such an intensive application (they require a letter of recommendation), they should offer more than one round of interviews with various people in the company. She also gave me my decision within one week.