I applied for the internship online. A recruiter sent me a link to a technical screening - two questions of difficulty on par with the "medium" problems on LeetCode. Not too difficult, and within a week I was contacted to setup a paired programming interview. The paired programming interview is a 45 minute long exercise where you are given a problem a little more difficult than the technical assessment. The premise is that you will be working on it alongside your interviewer - hence the "pair" part - but unless my interview was atypical, instead, it is simply like any other coding interview. The interviewer watches your progress and may offer a few tips if you get truly stuck, but otherwise they are there to assess and little else. That may be my only complaint here -Square makes a big deal about these "pair programming interviews" being a revolutionary new concept, but they seem to be identical to other coding interviews. Worse, they're even identical in the worst way; the interviewer did not seem interested in my ability to methodically solve the problem logically and to accurately assess the algorithms I was employing, and instead he was interested in whether I could solve it quickly and with little thought. That is to say, like most coding interviewers, he wanted a LeetCode champion, not the result of four years of well-marked schooling. I knew I had failed the interview less than 20 minutes in by the sound of his disappointment. To be fair, that's on me - I should have put more practice into LeetCode parlor tricks because that's just what the business is about, but it was disappointing to see from Square. All of that said, everyone I talked to was very friendly and I am likely to apply again in the future. I will also give them props for sending me a rejection less than 3 days after the interview, because the wait for these things can be agonizing.

3 rounds of interviews, all oop, pretty simple lc easy/medium. Rejected for headcount. Practice LC implementation, usually 2 followups. The main thing is to implement quickly and note limitations while doing so.