Old fart here. My favorite interview question is this: Tell me about a project, any project large or small, that was 100% you. You thought of it, you coded i

Old fart here. My favorite interview question is this: Tell me about a project, any project large or small, that was 100% you. You thought of it, you coded it, you wrote the tests, you documented it. The only other requirement is that the project has to have at least 10 users who installed, used, and continue to use the project without any help from you. Lots of people don't have an answer. Some you need to coax a little, because a small project is fine. For example one that I did close to 30 years ago was move/copy utilities that used regexp. You could do move =.fortran =.f and it did what you wanted (first = is .* and second is $1 and they could repeat). Anyone with basic C skills could have done this (or perl, I think someone else did a perl version and that won). So people would think a project like that doesn't count, but it does. Small is fine, you just had to do the whole thing and people needed to be able to use it without asking for help. This covers a lot of ground and my experience is if you get lucky enough to find someone who has done projects like this, and there is at least some overlap with what we are doing, yeah, we got lucky.