Pros
I've been really impressed with Square's diversity in hiring in St. Louis, including those that don't have a traditional tech, finance or call center background. I think the benefits are amazing. We are compensated well for overtime or holidays. Customer support at Square allows you to completely connect to Square's mission of making commerce easy. I feel like decisions at Square are made to best impact the end user, not just to make money or take advantage of people.
Kontras
You really have to be okay with change. The metrics to measure performance were very different when I started, but I think it is finally coming to a place where it will be steady for a while. You will do better at Square if you can be flexible with your shift, overtime, your lead, where you sit, how you're measured, where you're focusing your efforts, etc.