First there was an online test, then two interviews: a technical one and an HR one. The questions in the technical interview focused on the basics: OOP, some Python libraries, data structures and an algorithmic problem (this was the tricky one). It was one of my first interviews so I wasn't very well prepared, but they were very understanding. After the HR interview I didn't receive any response for a month or two, so I figured I didn't pass, but it took them very long to announce me.