The company I work for would be a great fit -- we specialize in conducting remote technical interviews as a service. It pays pretty well ($100 USD per 90-minute interview). The work is very flexible and you set your own hours, so it works for people aiming for 5-10 hours a week or people interested in more than that. Although it's not a traditional software development job, the work still requires a significant technical skillset.
If this is the kind of thing you (or anyone else reading this) might be interested in, send me an email and I would be happy to talk further about it! My email address is in my profile.
* consulting: providing your expertise to others. I have picked up a few gigs doing code evaluations or pocs for people. Helps if you have deep tech skills in a niche and a reputation. You can do this by blogging about it.
* contracting/moonlighting: writing code for companies who need it. Join a slack and watch the jobs or contracting channels. Email former employers and ask if they know anyone who needs some extra hands.
* tech writing. My company pays for technical articles. I know others do too. draft.dev is a kind of a clearing house for technical article writers.
I'd also google "<area you live in> slack" or "<front end technology> slack". You could also look for discords, I hear discord is hot right now and several communities I follow have moved to it from slack.