Would you mind sharing some contact information for these companies looking for C developers? I have been working as a contractor myself and while I currently seem to have no problem finding projects involving javascript, companies actively looking for C developers seem to be little shy in my area.

I suspect you are from the US, and I am from Europe, so this might be a problem. But still, if you are willing to write me an email, my address can be found through my github account that is linked in my profile.