If they don't have any code or project whatsoever they are able to discuss I have zero interest in interviewing them.

I have never said this is a universal formula for all to adopt. This is what I do. And it has worked very well for over thirty years across a range of engineering disciplines. Google and others can't take this approach because they need to hire people by the thousands. Not me.

Another interesting thing is to talk about someone's hobbies and passions outside of work. This is where you can learn so much about a person. People are passionate about one or more things and that is a reflection of their personality.

We do a lot of work in aerospace. There are very obvious legal barriers to disclosure there. Yet, I have always found that most engineers who are truly engaged with their craft have enough interesting things to talk about outside of work that you can really get a sense of who they are and how they will approach work.

An interesting example was when I needed someone to work on some Python code. I brought in people who had zero experience with Python. I could not care less about that. I wanted someone with some of the qualities I have already mentioned. I ended up hiring a programmer with lots of C++ experience and no Python chops at all.

The first three months were dedicated to taking a deep dive into Python while getting up to speed on the project. After that the focus shifted to the project itself. This person has been with me for many years and doing an amazing job with various technologies we didn't even know we would touch when I hired him.

I know this person can pick-up any technology we might need to utilize and do an excellent job of it.

The investment is in the person, not the technologies or the ability to memorize coding puzzles.