Median tenure for SDEs is around 1 year, possibly 2 years in UK from my experience.
You will not receive any bonuses / salary increases in your first 4 years. The people who came on top in the review process received peanuts (e.g. 5 stocks that vest over 4 yr). This may change as the AMZN stock price has plateaued, but don't bet on it.
Brutal HR practices around performance management.
Many SDM (managers) are poor, even manager of managers. They make up for it by being aggressive and working their teams' heads off.
Managers have a lot of power and little accountability. If you want to transfer inside the company, a nasty but not banned practice is to put you on a perf improvement program. This prevents you from transferring, and they do not care that they crush your spirit. No soul.
The best work life compromise that I have seen some people achieve is "work 10-12 hours a day, but enjoy the week-end".
During the week-end, the email chatter is at the same intensity as on a Friday. This includes upper management. And I don't mean that people work for an hour or two on Sat, they are working the full Sat and / or Sun.
During the hackathon I was asked by a team that I wanted to join if I was prepared to pull an all nighter (i.e. 36 hours of straight up coding). I don't think they did it in the end, but they had no problem doing this or asking.
Horrible internal engineering system (custom build, CI / CD, package management, code review, test infra, everything is custom). I'd say you take a 30% productivity hit in your first 6 months because of this.
