I don't think it matters whether you choose iOS or Rails, but it is probably best to choose one or the other so you have a clearer story to tell. Being able to

I don't think it matters whether you choose iOS or Rails, but it is probably best to choose one or the other so you have a clearer story to tell. Being able to say "I'm a Rails developer that will be graduating in May, and I've worked on X, Y, and Z" puts you way ahead of people who are still figuring out what they want to do. As for finding work, I'd suggest choosing a handful of companies you're interested in and getting in touch with them now. You can talk to recruiters about when you should apply, ask about informational interviews, or if they have open-source projects, potentially start contributing to those. If you live in the locale you'd like to end up in, I'd also suggest going to any meetups that interest you. Meetup.com is a great place to find these.