[TallGuyShort]

Adding this a bit late for it to be an edit, but I'd add that I think it's unfair for employers to have open-source work as a de-facto requirement if they don't contribute to open-source themselves. Open source is also a chance for you to see how the company's existing employees comport themselves, how they work through problems, and what kind of day-to-day problems they're working to solve.