A good way to ask questions is to use them conversationally. For example: interviewer: What is Cassandra useful for? interviewee: It's useful as a highly-a

A good way to ask questions is to use them conversationally. For example: interviewer: What is Cassandra useful for? interviewee: It's useful as a highly-available database if you can denormalize your data. What are you guys using Cassandra for? interviewer: Well, we're using it to... interviewee: Interesting. How's that working for you guys? This not only can get you some valuable information to make your decision, but also looks confident as you're exercising some control over the interview. You just have to be careful not to derail the interview with this technique, or you'll come off cocky and arrogant.