It cost 5 interview rounds:

• An introductory one that lasted less than 15 minutes.
• The second was completely in English, to assess if I would end up on an external or local team.
• The third was a remote technical interview, with two exams of different durations; one was 4 hours long.
• The fourth was a technical evaluation in front of two engineers.
• The fifth was with the person who later became my team leader.

Many questions about structures and what approach you would take for a particular case. Emphasis on efficiency.