It started with a coding test (HackerRank) which I passed. Algorithmics questions. I then had an interview with a senior quantitative developer in the team. We discussed my background, the role, and he then pulled up the code from the test. We discussed my solutions, and how I could optimise it further in one of the exercises. He seemed happy with my answers. There were no maths / probas / stats / ML / quant finance questions. The feedback I received via the recruiter was that I had done well. One month passed, no news. They then told the recruiter than they wanted to "move [me] forward based on my technical skills but that [I] didn't perform well enough in the actual quant interviews'. Here's the thing though : there were no "actual quant interviews". If you don't want to interview me further, well that's a pity but that's life...but why would you invent that I did not perform well on interviews which never took place ? In total, it took 2 months from profile being sent to that weird feedback.

Long telephonic and video interview. Maths, probability questions and a small programming assignment. Moderate difficult interview level. Motivation/ interest to join cit sec. Started on time and very efficient use of time