Had a 30 minutes interview with 2 people from the team. Both very nice and friendly. I first had to introduce myself, then it was a full technical interview on how to optimise ONT technology. The difficulty of the interview was subjective. For me, it was very easy and interesting, as I revised very well and the technical questions required me to take time and think about the answer rather than just saying something by heart that I learned from their website about their technology. But I can see how this interview can be very difficult for other people. So on short, do your research about the company before you have the interview! I received an offer 2 days after the interview.