Was contacted by recruiter through LinkedIn. Had an initial chat with recruiter and then a "pairing interview" with an Engineer. We walked through a problem together, and I got a running solution, though I couldn't gauge how well I did because the Engineer did a lot of talking which isn't usually the norm. Generally in technical interviews, someone just gives you a question, then sits there and sees what you come up with. I prefer this method of working through a solution with your interviewer. I was then invited on site to their San Francisco office. During the onsite there are three 1 hour code "pairing interviews"" and then two architectural discussion interviews, one about past experiences and one about designing an application(I got hotels.com as others have said on glassdoor). I expected my code pairing interviews to be similar to that of my phone screen, but to my dismay, my first two interviewers were not interested in being collaborative. My first interviewer had a laptop with was clearly working on something else. My second interviewer didn't say much at all, and was yawning throughout the interview. I thought both were a little unprofessional to be honest. My third interviewer for the code pairings was much better, and might be one of the best interviewers I've ever had. He gave me a problem, and then we talked through it first by drawing out solutions on a piece of paper, and then I implemented it. This is what I thought my other pairing interviews were going to be like, and based on reviews I've read on here, it seems like that this type of collaborative process is what a lot of Square interviewers try to follow. I wish all my interviewers followed this process. I had lunch in between my pairing interviews with a square engineer and was given a tour of the office. I had my two architectural interviews in the afternoon, and then finished up by talking to the hiring manager and then finally my recruiter. I got a rejection two days later. I could've done a little better on the pairing interviews, hopefully people reading this will get more collaborative interviewers during the onsite. I thoughtoverall, Square's process is a lot better than most big companies. I do think Square tries to push the practice of making their interviews collaborative, but maybe not every interviewer will necessarily follow the guidelines. So basically prepare to do a whiteboarding interview on an IDE, and come up with a working solution in under an hour. As other Glassdoor reviews have mentioned the pairing interviews are not exactly your typical leetcode/CTCI questions.