Working here will give you some unique technical challenges as well as giving you an opportunity to work with some of the brightest minds in the industry.
However, the culture is toxic and there are many underlying issues with the company. With the new wave of Amazon executives, the company has taken a turn for the worse. The culture is now a culture of PICs/PIPs and performance management. Employees are now under constant stress to not only meet the expectations of their role, but to try and sell themselves to anyone and everyone so that they can remain viable. This of course creates an environment that is full of fear and one-upmanship and takes the joy out of the job. It is a constant struggle mentally and it shows on the faces of the employees daily. Many employees are waiting for the IPO - which keeps being delayed over and over again. It's a running joke that IPO is "one year away", but this catchphrase has been used for the past 3 or 4 years.
Think twice and thrice if you are considering working here. Management is not transparent, though they would like to think they are. Surveys are not anonymous even though they continue to remind us that they are. There is constant turnover, don't let the company try to convince you otherwise. They will say they have not had to layoff people en-masse (like Google, Amazon, etc), but they either performance manage people out (in droves, around 40 the last quarter), or they make people redundant only to fill their roles a few months later, or people just quit in disgust. Recently, a number employees were made redundant, the company held a meeting to let the employees know, afterwards, the employees were asked if they had any good jokes to tell. Seriously, what is wrong with the management here?
To work here, you'll need to wade through a daily minefield of favourtism, deceit and fear. Make sure you understand what you are getting yourself into.