The profession is regulated, but not all practitioners are licensed professional engineers. A licensed engineer needs to oversee, verify, and sign off on the work. It does not need to actually do the work. I worked for four years as an electrical engineer, but never even took the FE (then the EIT) or had any intention of gaining licensure.
And even that oversight is only required in some circumstances, mainly when the project involves potential risks to public safety. Not every project needs to involve a PE.
