So let’s say I got hired from a startup and they want me to do all the design related stuff. Web design (PSD, HTML5 and CSS3 ), User Experience, graphic design (logo, banners/tarpaulin)
What is the right job title for this? I’m thinking about Art Director but that job does more than that.
“Designer” 
These jobs can done this persone “UI/UX Designer ” 
“Visual SEO UI /UX Responsive Design Director 2.0” sounds about right to me 
“Master Chief”, “The Dr” 
We had a guy like that in my old company, we used to call him “Odd Job” and “Random Task”, partly because looked exactly like the villain in the Bond movie.
not art director it could be “creative problem solver” or “senior web designer”
