First, hirevue. Asked typical why mercer, tell me about a time, etc. Then three interviews back to back, all behavioral. Very friendly and conversational. Asked about my experiences, left it open for questions

Very fair and relatively laid back. Process starts with a HireVue, followed with an interview one on one. Both of which are behavioral. The final round interview was 4, 15 minute increments with four different interviewers. All great and very friendly, unfortunately did not receive the offer. But, overall great recruiters, very friendly and genuine.