First there was a 20 minute call with HR. After that there was a technical phone interview. It covered both coding (Python) and SQL skills. After the phone interview I was invited to on site interview. On site interview consisted of five 45 minute consecutive interviews. They included coding part (Python), SQL part (Whiteboard), database design part (schema design and queries writing), "lunch interview", and the last one was with PM. All parts were very good, interviewers were very friendly and helpful. I felt neither pressure nor anything negative. The only negative thing is that Square hasn't reimbursed me yet (I flew from another state) although the on site interview was 2 month ago.