If they are "desperately hiring," why aren't they promoting the positions? Even mentioning them on their own websites? Putting the word out to recruitment agents etc. Just seems strange, that's all.
http://www.ventureloop.com/foundersfund/ http://www.felicisvc.com/jobs.aspx
Smaller individual angel investors have more ad-hoc operations and haven't bothered with streamlining hiring for their investments. This may change.