The first part of the interview process was a casual talk with one of their HR's.
The next one was a technical interview with their CTO. A lot of broad topics, such as knowledge of core Scala, Kafka, RabbitMQ, and some questions about design systems, etc.
The step after that was with their CEO. Pretty much, about mine and theirs expectations.
The last interview step is with their client, which is usually a technical interview, and it can be pretty much anything. From an interview about your experience, to an interview with live coding.
Although we didn't agree in the end, I must state this was one of the best interview experiences. The sheer dedication of their team was nothing but outstanding. I strongly recommend contacting these people if you're pursuing new opportunities in the Scala ecosystem.