Formal, professional, case-based, friendly interviewer. Went inside the room, he asked me to introduce myself and then asked questions based on my introduction, asked a guestimate, few hr based questions, about my work experience

Rigorous but fair questions - mostly case based. Two sets of interviews x 2 rounds. You only get invited back for the afternoon if you pass the morning round. They expect a high degree of mental math and creativity. Worth prepping for standard case interview style questions, using frameworks but able to adapt them.