Earlier quoted context omitted.
Not so. In some states, engineer is a protected term. https://en.wikipedia.org/wiki/Software_engineer#United_State... edit I may have been mistaken and the word engineer itself may be non-protected, but the term software engineer specifically is protected in Florida: http://www.leg.state.fl.us/Statutes/index.cfm?App_mode=Displ...
No, "Engineer" (as a proper noun) is protected as a synonym for "professional engineer" (common noun phrase). The common noun "engineer" is not protected in any States.
That said, in my experience all manner of technical professionals (and even not so professionals) in Texas do routinely call themselves engineers whether they're supposed to or not.