Here's a radical idea (read to the end before you object). The inspiration is a blend of how open source projects recruit developers, and how the 20% Google side-projects used to work.

I work for company A, I'm starting to get slightly bored or interested in doing something else. Without quitting my job, I contribute a few days of code to company B, whose project I find interesting. As I contribute more to company B, I eventually quit company A and join company B full-time.

Benefits of this approach: no interviews. Know what you are getting into. Try different things and what works for you.

How can we make this work: legal framework. California, if you are listening, pass a law that prevents companies from exclusive work arrangements, so I can always do a side-gig with company B even if they are competitors. Have company B compensate me, so we don't end up in a situation where company B is abusing job seekers by getting free work done. Maybe a law could say that I'm safe as long as my work for company B while employed by company A doesn't exceed 5% of my salary or so.

Would that work?