Meta Data Scientist interview questions

I have a PhD in computational neuroscience / psychology. The Data Scientist position looked perfect for me because of my interest fitting models to large datasets describing human behavior. The HR person was nice. The interviewer was someone from the data science team-- nice and very young. He had me go up to the white board and write C++ code to answer a few questions. As a PhD, I was expecting research type questions, not coding. So I got a bit nervous. I didn't fully understand all of his questions and he helped me. I left feeling kind of annoyed. It probably wasn't the right job for me because I am not a software engineer.