As a candidate, I tend to ask that one of two conditions be met for these kind of projects: Either: 1. It's open-source and I can show it/share it as I see fi

As a candidate, I tend to ask that one of two conditions be met for these kind of projects: Either: 1. It's open-source and I can show it/share it as I see fit in the future or 2. They pay me for my time. I prefer #1 actually, and most companies will be okay with the open-source thing, but will usually ask that you not share it publicly (on a github or anything), so that other candidates can't find it. I like this option because it gives me ammo the next time I'm asked to do a coding challenge ("Okay sure I'll do it, but did I mention I'm already in talks with a few other companies and have already finished their coding challenges? Here take a look! If these don't show you what you need to know, I'll take your test too."