I applied online and was contacted a few weeks later to schedule a phone interview. I went through two rounds of phone interviews with two engineers each time. I don't know if it is planned this way or not, but for both rounds of interviews the initial interview was with a really encouraging and motivational engineer and then followed up by a distant more serious individual. It kind of threw me off my game going from the "yeah I got this" to "where did I mess up" mindset, but in the end I had a great experience Interviewing with American Express. The engineers had more enthusiasm than other places I had interviewed with, and did not come across as brand ambassadors. They also answered questions candidly. I found a lot to respect.