It was quite formal & lasted a couple of hours. I had to answer a question on current events & international relations. Then I had an interview with the head of the team I would have been working with and the head of HR. It lasted about 30 minutes. I then had a short discussion with the head of the team. The final step was an interview with the CEO, which was trickier: he asked me to tell a joke or spell words. I still haven't heard from them.