You mean to say licensed. Regarding terms, "license" means a government grant for one to perform work. "Certified" means have passed qualifications usually by a non-profit non-legislative body. i.e. doctors need a license to practice, certificate from Microsoft shows you are knowledgable about a specific software (ok there are many pros and cons on this one). Regarding "Engineer" you need to be licensed to practice engineering. In fact you can't call yourself an engineer unless you are licensed. But then, i.e. Silicon Valley, who cares as there's lots of engineers that do engineering. Except for civil engineering, they are very critical and demanding on being licensed.
One thing about being licensed if you screw up, people can contact Dept of Consumer Affairs and make a fuss. They also can find out where you are so before you pound that PE stamp on those drawings, you are probably going to be sure it is all been performed above minimum competency.
But it all comes down to what can you do? Are you competent? Do you know your stuff? Can you address problems to management or the customer so it doesn't end up as surprise disaster? Or are you simply stuck in a Dilbert situation which sounds like many of the programmers were in this healthcare.gov website.