wondering about the same, I'd be really interested in Etsy as I have been a seller myself. I come from more of a front-end background with some knowledge of working on the backend as well, but don't have extensive experience with the BE technologies mentioned in the posting
I have done ASP.Net before and dabbled in rails, django etc. It's been 2 years since I actively worked on the backend though, I still go in once in a while to fix bugs and whatnot but nothing super extensive.