[pryelluw]

I do mention my side open source side projects, but not side hustles.

[PragmaticPulp]

This is a good distinction.

Side projects = Fun project that demonstrates skills

Side business = Ongoing obligation that could distract from your job.

Be careful in how you present them.

[ergocoder]

Side project isn't really impressive though like a to-do app in Rust. Yeah, that doesn't mean anything.

Side business actually is. Because it means you can build, launch, acquire, and retain; and you have to deal with customers.

This means you do have skills to be in a senior position.

[mxuribe]

I was going to mention that if you somehow turned your side project into a side hustle, that could be received well, because it shows you were able to evolve your project into the business (maybe even monetization) direction...but that would require really careful, nuanced explanation...so i defer my position to what @PragmaticPulp rightly stated about being very careful in how that distinction is presented (to avoid concerns around distractions, etc.).