Amex had an info session at my college campus where they told us everything about Amex, right from their work culture to the kind of challenges they face in serving a huge customer base. I had a coding challenge which involved solving 2 questions in 20 minutes. I was able to solve 1 question completely while the 2nd one was halfway there. The questions were not very tough due to the short time period. I had a second round wherein I interviewed with the Tech Delivery Lead. It was a 45 minute technical interview. I was asked to explain my academic projects and work experience in detail.