It was onsite interview. Reached out by HR. I was asked math, probability, stats, coding, behavioral questions. About 4 interviewers. Lasted for 2 hours. Positive interview in general. Interviewers are very friendly.

The initial interview was a screening call followed by an interview with the director and then a panel interview. The whole process took around 3 weeks. Since it is for validation they are not expecting you to build any models.