I applied online. The process took 3 months.

The selection procedure is mostly focused on assessing whether you can be a good fit personality-wise and in terms of general problem-solving skills, with little technical deep-dive, but your mileage may vary. As far as I know, the interviewing process can be quite different depending on the applicant, with more or fewer interviews required. As I speak Italian, some interviews were in English, others in Italian, depending on the interviewer. Most interviewing rounds were 1-on-1, except for a live problem-solving interview, which had 2 interviewers. Interviewers were always polite and happy to answer questions, even if it meant overshooting the interview time slot. From what I was told, interviewers are not aware of where you are in the interviewing process, or how you fared in other stages, to minimize their evaluation bias. At the start of the interviewing process, you are assigned a recruiter who follows you during the process, and provides quick and constant feedback after every stage, plus answers questions if you have any. I appreciated their flexibility once I asked to speed up the recruiting procedure as I had other pending offers. The full process took about two and a half months.

The process consists of several steps:

• A generic online IQ and pattern matching quiz, for which you can easily find examples online.
• A set of online logic tests, thirty minutes each. They range from traditional text comprehension to measuring analytics skills. No specific background is required, but a little probability background can help, along with keeping an Excel sheet at hand. I found them quite enjoyable and stimulating.
• Other online tests, including two coding problems where you can use whatever language you want, one hour each, and one personality questionnaire where you have to answer some more traditional HR questions.
• A first HR interview.
• A live problem-solving interview, where I had to solve two logic problems.
• Another HR interview, similar to the first one but with a different interviewer.
• A technical interview specific to your role.

After that, you might have to do more technical interviews or have a chat with other teams. It really depends on how well you scored in the previous steps and how well you fit in the position you applied for.