Stressful: everything is about metrics, how much you do, how well you do it. You are compared to your teammates when it comes to performance review and you are told if you performed better than your team, average or below the rest of your team. The core job is repetitive and if you want to work on other roles you mostly have to do it extra hours, the teams are often stretched and you'll be on the phone 6-7 hours a day.