After taking an online assessment, there will be a call for 30 minutes with HR. After that two interview days follow, where one on one conversations with managers of all levels are scheduled, from 9 to 5 more or less. If you get the "ok" after the first interview day a second one is scheduled. Suit without tie and standard laptop bag is totally fine as dress code. Interesting concept, had a good experience overall. It is important to know the company's key figures, to read the annual statement, but nothing too detailed.