It seems like I should mention that we (Julia Computing) are actively hiring. If you think what we're doing is interesting and would like to join in, please do reach out!
To narrow down, what we're looking for in the immediate future, anybody with interest in core language development, compilers, tool chain support, etc. Additionally, we will probably be hiring for our applications development team very soon, so if you're interested in data science, stats, etc. and like working with people on solving their challenging problems, please do reach out as well.
I'm trying to make an architecture decision right now and this would be helpful (and whet my curiosity :p)