> It's not terribly surprising to me that he simply doesn't have experience with coming up with architectures on the spot. Or, maybe they spent their career mo

> It's not terribly surprising to me that he simply doesn't have experience with coming up with architectures on the spot. Or, maybe they spent their career mostly building applications and not architecting systems. Those are very distinct skills. Of course, it also doesn't help that in an interview context, "system design" can mean "design infrastructure to support a system," or "object-oriented design of a system."