Amazon reviews

You get a pager pretty shortly after starting and are expected to respond to it at all hours. Management expects everyone to work crazy hours and thinks nothing of asking you to work weekends, nights, or even cancel your vacation to support a project launch. Cooperation between teams is nearly non-existent and you will often wind up implementing necessary features yourself. Due to political wrangling you can wind up taking on responsibilities far outside of your realm, like taking over QA's job for a spell. You are expected to provide frontline support for the databases despite your level of database knowledge. Unless you are really lucky or really senior, expect to spend < 25% of your time actually writing software - most of your time is spent troubleshooting or triaging emergencies.

It's very easy to work day in, day out without much reward and get burnt out. There is low morale in several groups, and in my particular group it was fear rather than interest that was driving people so hard. The company's frugality also begins to wear on everyone after a while.