Super casual and nice interview process. They had me go through a total of 3 rounds.
First round was with the hiring manager, about 30 minutes, discussed general background and experience as well as company culture and fit.
Second round was about 45 minutes, with the manager of the team I'd work on. We talked a bit more about what the work was like, the tech stack, and my experience overall, some technical database questions, and general OOP questions.
The third round was with the entire team I'd work with.
This round was about an hour. I got to know the team members, what the work was like, some past issues, and such. They asked me general CS questions, looked over some of my old code, and just generally got to know what I'm capable of.
The interview process was fairly quick, faster than any other company I'd applied to. They got back to me with an offer 2 days after my final interview. Overall it was a very enjoyable experience. Everyone was super professional and down to earth.