I applied online.

Once you pass the CV screening, there are three to four steps to be completed at any time. Each step has three to four tasks, and if you pass them, you go to the next. Each task is either a logic exercise, for which you can't really prepare, or a personal open question about your motivation or experience. The last two steps are coding exercises. I've passed all the tasks and failed on the coding questions because of the time. I have added comments and explained what I was doing, but since they look for "Excellence", they rejected me.

The whole process happens without meeting anyone, and only a recruiter follows up with some emails. The logic questions are pretty cool, but there is no room for error, and if you make one, there is no possibility to explain it. After ten hours spent on the process (each task takes approximately one hour), it would be nice and polite to give some personal feedback and/or let the chance to the candidate to explain what went wrong.

Given a number in base 3, write some functions to apply operations like sum and shift. Then write more functions, and then with more data at hand, optimize the functions.