Pros
1. It is quite likely that you will be able to find employees that are incredibly smart. Engineers are helpful and understand business. 2. As an engineer, you are expected to do more than just do engineering work. You are expected to drive business and make decisions with the help of your manager. There is a very good chance that as an engineer, you will be able to lead a project within the first year of being there. 3. Mobility is not a very big issue. The company is so massive, and considering everyone is looking for smart software engineers, if you are good, but not satisfied with the work/manager that you are working for, there is plenty of opportunities that you will get to move to a different part of the business. 4. If your primary aim as a software engineer is to learn quickly and are willing to put in the time for it, it is a good place to be.
Cons
1. Perks are pretty nonexistent. There is nothing really to talk about in terms of perks. If salary and the amount of money that you will earn is a major concern as a software engineer, the first two years will pretty much not give you that (their stock vesting schedule is one of the worst I have seen). 2. The dreaded oncall can be hard on some people (especially people with families). However, it will make you learn faster since you will get hands-on with the software. 3. For immigrations, the Green card process takes a while to get started. Their policy says that you cannot get a Green Card process started unless you are Level 5 (which is SDE 2). While there will be exceptions, usually SDE 1 to 2 takes between a year and a half to two years. So, you might want to consider that.