My response came from a windows desktop with a fairly nice monitor. I just checked on my macbook (retina, 15"), first on osx, and then on Ubuntu. You're right, it looks much better! I still think that loading the ubuntu font from google fonts would be better (and then using arial/tmr as a fallback) but to each their own.

As far as the general design, I don't want to be too harsh but the website looks a little 2005 to me, if you judge by this (obviously unofficial) scale: http://i.imgur.com/7f24Qfs.jpg. This reddit thread is a great place to find good websites (http://www.reddit.com/r/web_design/comments/2zpk4u/best_site...) but a few quick suggestions would be to toss the plain white background, make the main search box a little more pleasing, making the logo and text a little bigger, and try a more modern design for the actual job list (I would look into something like what hckrnews.com does or one of these http://www.freshdesignweb.com/free-css-tables.html).

Also, and I hate myself for saying this, but you may want to look into using bootstrap (http://getbootstrap.com/). I was originally against it since it makes websites look similar and I generally like to write my own code, it does make it easy to modernize projects.