That UI looks awfully similar to a theme I've seen used in SharePoint Portal Server. I hope that's not what they use for the front end, but I wouldn't put it past them.
Having worked with SharePoint extensively for years, I'm highly confident this isn't the case. It's just plain-old crappy custom-coded HTML4 forms from what I can tell and similar colors, so one could easily think so. But at closer look, it definitely not any of the SP versions 2003, 2007, 2010 or 2013. Maybe 2001 but I highly doubt even that.
