As Smart DSP's founder is based and registred in Quebec (Canada), some country/regional laws applies to us in our communication/entitlments.
In Canada and Quebec there is a structure named "Ordre des ingénieurs du Québec" which you need to be a member of to be able to use legally the denomination of Engineer.
Following the legal Engineer Act, this engineers order is strictly reserved to a few professionnal domains which does not includes audio : http://legisquebec.gouv.qc.ca/en/ShowDoc/cs/I-9 .
However in the rest of the world, technicians with our competences/providing same services either in sound design, mixing or mastering are called Audio/Sound or Mastering engineers.
Here are some other denominations you'll find : https://musitechnic.com/en/sound-engineer-2/
Keep in mind that it doesn't mean at all that our technicians are less experienced or have worst gear... It's only a legal obligation for us.
Judge our technicians work by listening to their references & talking to them.