Are you just manually updating the page by hand when people add jobs? Kinda concierge style. I would actually respect that all the more.
People talk a big game on MVP, but it's cool to come across where someone actually gets it.
How did you get your initial inventory? Just manually sifting through HN posts? I think getting new and quality inventory will be the biggest challenge, that's harder than getting job seekers.
You've basically created a less crappy and niche focused indeed.com:
http://www.indeed.com/jobs?q=&l=Remote
I'm not sure if indeed.com spiders automatically or what, but I'm guessing you could emulate their approach to getting job openings.
Another option is to try to actively partner with headhunters who often have a source of inventory you wouldn't normally see on job boards.
As for the UI, ignore the haters. The simplicity reminds me of Startupers (http://www.startupers.com/) which is doing just fine.