I applied through employee referral. The recruiter call is only about the slot booking for the interview with hiring manager. In my interview, he asked about my relevant experience, A/B testing, Marketing Mix Modelling and regression based question. Most of them were about "tell me when you worked with ....."

HR call was only about booking a slot with the hiring manager and his manager. Interview went well. Asked me about my relevant experience and A/B testing related ( situation based questions ). Also asked about Marketing Mix Modelling and regression. I guess they wanted someone with more MMM and A/B Testing experience.