Lots of good answers here (and in this thread in general). I like to focus on the person's history and dig in - war stories for sure. For a software architect y

Lots of good answers here (and in this thread in general). I like to focus on the person's history and dig in - war stories for sure. For a software architect you should get a lot just from their CV/Resume. In the interview you get to test how valid and deep this experience is. To your list I'd also add some human factors. Some behavioral interview questions about dealing with difficult people, entrenched opinions, people under stress. You've also got questions such as "what is your favorite/last book on this domain and what was your take away". Or more generally what you like to read and how you stay in the loop.