The owner of the company asked me questions about first order logic translations. It seemed to be mostly a proof of logic competence interview. I mentioned I might also be interested in software engineering so we launched into an interview about this role right afterwards.

Ontologist candidates all go through 1 on 1 interview with CEO Doug Lenat in which he asks them questions to get at their ability to do precise logical thinking. Some questions are about logical representation ("How would you represent <foo> in first order logic?") and others are more like brain teasers.