I spoke with the supervisor while a fellow lab researcher listened in, and later the director of the lab group stopped by very briefly. They mostly asked me questions about my technical background based off of my submitted resume, and there was also a simple, open-ended question about the experimental problem the job entailed to assess my thoughts and approaches. Later, I was shown an experiment in progress similar to what I would be working on. The interview was mostly informational in nature, and took 30 minutes total.