[LinuxBender]

I think you are asking a legal question? I am not a lawyer, but I can say that some governments in some countries require specific certifications in order to hold certain titles for certain government jobs. Otherwise the answer is yes, you can have whatever title you want provided that title does not imply any legal requirements doctor, lawyer. Your CV and interview with a business will help them determine if you meet the definition of your title. I have phone screened people that listed themselves as Sr/Principal ______ engineer and they could barely Google any of the answers. They won't get in trouble but they also won't get hired.