Do you know how rare that is? In 25 years in the IT industry, having interviewed at dozens of places from large multinational organizations to dinky indie creative studios, I can only count twice where I was interviewed by more than one person at the same time.
Not that rare to be honest, I can't remember the last time I was interviewed by just 1 person.
Certainly within my current place the interview panel tends to be 3 people, usually from different demographics too if possible but not always practical depending on scheduling.