You are really in big trouble if you come across a job interviewer who just keeps talking.
What the interviewer really should be doing instead was asking questions, then listening to what you have to say about yourself and your work experience. You came for a job interview not to listen to a marketing presentation.
Technically speaking, we say such a person has got logorrhea, an actual illness and pathological inability to stop talking. Sometimes, and less serious, you see a word like loquacious, for people who talk a lot and often about stuff they think we should all know.