Worked in an AWS team, and the biggest issue was constant fire-fighting and oncall/operational load. Code quality is really bad across all teams in AWS due to constant prioritization of features over stability. We use to get 20 pages a day, and it was very common to get 2-3 pages in the middle of night. It was horrible and yet management didn't pay much attention on fixing it. At the end devs starting leaving the team one by one. Recently I heard that the team hired twice the number of devs to reduce frequency of oncall rotation.