What is your background. "A job using Linux" is super broad and remote work only narrows it further. If you don't have plenty of experience, it'll be hard to get a remote position.
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Can you be A LOT more specific about your skill set and experience?
If you hate job boards then you need to find individual company "Careers" pages and go from there.
How you go about this varies a lot by skillset and industry, but I'll just throw out a random example: lots of Linux jobs exist in the DevOps space (think Kubernetes, Ansible, Chef, NixOps). It just so happens that lots of medium-sized software companies need DevOps people, so you can pretty easily find companies looking for DevOps hires just by browsing Y Combinator's Startup Directory
With that being said, I get the impression from the way your post is worded that you're looking to break into a new career without having yet established a concrete plan. My advice would be to step back and consider specific options first. Almost all jobs like these require industry-specific certifications (e.g.: CompTIA, ITIL, AWS, Azure, Cisco, etc.). You need to look at your options, pick a certification, earn it, then go job hunting. Certifications are great for securing entry level jobs and the standards body issuing these will often provide an online directory of partner companies who are currently hiring.
Sadly shitty websites is where you have to put your info to get a job usually.
On the Fediverse with micro-blogging like Mastodon, Pleroma and similar there is a hashtag which is related to work. I forgot what the exact hashtag is but I saw other people recommending it whenever people ask for job opportunities. If you get a match you may be able to contact them directly via email. Good luck!
We have 4 raspberry pis at our office, does that count?
What if my experience is 0 but I want to go this route?
Get experience. Get the RHCSA cert or something.