Google

Google has managed to recruit an excellent community of engineers. Engineers are friendly and very knowledgeable. Generally, management has made the community collaborative rather than competitive or contentious. It is a wonderful environment where your software skills are valued and nurtured, and where you can learn from your peers, some of whom are leaders in various sections of the field.

There are few "cons" to Google. One possible thing that can be mentioned here is that Google is a very large company, and it is somewhat easy to find a corner in which to lose oneself.

Another possible knock is that Google has a small number of allowed languages. If you want to code in languages other than C++, Java, Go, or Python, you'll probably not have much support at Google.