Pretty casual and straightforward. Welcoming faculties and staffs. The interview is more like a confirmation once the decision is made by the hiring personnel. Just providing a data point here.

The interview was held face to face. It only takes 5 minutes long to let the PI decide to take me. No hard challenges were met. Overall, it was a professional and happy process.

Casual, as I knew the Principal Investigator. We spoke once about the position, and I accepted the offer. I learned more about the position and the opportunity arose when the PI's funding came through, albeit a little bit into the fall semester. I met the primary administrator and other staff during the process. All were welcoming individuals who gave me the opportunity to ask questions.