At the end of the interview you will probably be asked if you have any questions. Please ask something, as saying “No!” is a disaster.

It is difficult to prepare a question beforehand because it could be that the interview has covered some of the questions you were thinking of asking. Some subjects that you might consider:

Prospects

Company history

Interviewer’s history at the company

Interviewer’s background

What happened to the person doing the job previously?

Why do their customers chose them?