There is. It's called the PE (Professional Engineer) license. Today, however, it mostly only applies to civil engineers. Back in the day, if someone wanted a bridge or building (especially for the government) designed, you had to be a PE to get the job. It required a certain amount of hours of work after college and an exam. Doesn't really apply to software though.

--When I got my first job as a software engineer, my dad, who's a civil engineer PE said, "I thought you were going to be an engineer, but it sounds like you're just a computer programmer." :-)

Auto union workers don't have a license needed. But yes not nearly as successful as the lawyer or doctor unions.