1) Submission of a very lengthy online application.
2) 1-hr telephone interview. They do not ask anything about the job. Questions are put-you-on the spot sort of questions. The goal is to get a sense of who you are.
3) Skills, IQ, Typing, and Personality tests.
4) Panel Interview, 2:1 Interviews with at least 8 people in groups of two, group reasoning activity
5) If you are hired into a bilingual role, you will also have to go through oral competency testing in the other language.
It is not uncommon for them to interview groups of 20-25 candidates at the fourth stage and hire no one, if they do not feel they are right for the position. They would rather start over than hire the wrong person because their initial training program last 10 weeks with an additional one year mentorship program. You are basically considered a trainee for at a least one year.