I emailed a Square recruiter directly since my friend had recently accepted an offer to work at Square. From there, I did two technical phone screens that I thought were both rather difficult and ones that I barely managed to solve in the end. Square calls their phone screens "pair programming", but it was very similar to a generic phone screen from any company - there's wasn't much of an increase in collaboration. However, my onsite felt quite different. The questions were much easier, and the engineers sat down with me at a computer to talk about and solve the problems together (which felt much more collaborative). I did two technicals on the onsite, a casual chat with a new grad during lunch, and then a "prior experiences" interview afterwards that ended up just being another chat about previous projects and internships I'd done. The SF office is extremely beautiful, and the food was pretty excellent. I received an offer a few weeks later (delayed due to being hospitalized and one of my interviewers being out of office for a week) and was quite happy with it and decided to accept. Overall, the people at Square seem very enthusiastic, although I've heard your experience at Square varies depending on what team you choose to work for. As my first job out of college though, I think it'll be a good place to start developing some good industry experience.

Inital take home, followed by extension interview, followed by a coding challenge, followed by system design interview. The whole process took 3 months! The interviewers are usually really nice and want you to do your best.