Several calls and an in-person interview (this was in 2018). The calls combined coding and background questions and were standard fair for these sorts of positions. The in-person interview was mainly about coding.

Most negative experience I have ever had. I was told by the interviewer that I was in store for a 30 minute behavioral zoom call, and so I prepared for about a week, making sure I knew all of the past experiences I can possibly draw from by heart and doing all of the practice zoom interviews. Then, the day came, I logged on and was greeted by a panel of 3 engineers. At first it went amazing, then after about 10 minutes I was told "Now the technical portion will begin." I was very confused by this, since I was told I was doing a behavioral interview by the recruiter that reached out to me. I told the interviewers immediately "I am not prepared for a technical interview, I was told this was strictly behavioral", and they essentially acted like I was lying about it. Anyway, long story short, I embarrassed myself in front of 3 engineers since the recruiter told me the wrong information. I then sent a follow-up email explaining how utterly unprofessional the experience was, with proof I was told it was behavioral, not technical and I got ghosted by every single person. The lead interviewer seemed like a genuinely kind person, but this is still the worst experience I have ever had out of around 30 professional interviews I have been a part of.