Ask HN: How Do I Hire a Great Rails Developer?

I haven't had any luck finding RoR developers through my personal network, so I thought I'd open it up to HN for ideas -- I have 2 open positions in the Bay Area (south bay) for front-end focused Ruby on Rails developers. The company recruiting team has the job boards covered, but only 1 candidate worth interviewing has come through that channel so far. There aren't any meetups I can find scheduled in the next few weeks, so I'm running thin on ideas. We are a mid-sized company in the real estate space, but I'm not mentioning the company name because I don't want this to seem like a recruiting pitch (although if you or someone you know might be interested of course drop me a note). So, HN, any ideas?