I've noticed that as well. For the RoR jobs at least, they list a bunch of gems that they use, as if this is the only thing you can or ever use, or else we won'

I've noticed that as well. For the RoR jobs at least, they list a bunch of gems that they use, as if this is the only thing you can or ever use, or else we won't hire you. Sure, in some cases you need a specific toolset, but it's not always the case. I think the job postings from startups with the random other stuff are more well thought out about what's involved (or could be) in your day to day.