First interview is with HR, to figure out if the candidate is proper cultural fit, and you tackle a salary and relocation. Second step is doing a home test, for which an applicant has several days to do (takes couple of hours to do). Third step is a technical interview, on site if possible, or online face to face conversation. Final step is an interview with CTO, who basically hand picks everyone with friendly and tricky questions. Everyone is very friendly, but also super professional, so don't expect anything, but expect everything. Advice: just be yourself, that's always the best.