I received two on-campus interviews, each 45 minutes long. The interviewers were nice, and the questions were standard data structure/algorithm screening questions.

Then I flew out to San Francisco to spend a day on the Square campus. I was shown around and participated in two more pair programming interviews, which were nice as you can use a laptop and check documentation. There were also recruiting videos and other activities.

String segmentation question (e.g., given string "therearefourwords", separate it out into "there are four words").