A simplified version of UX designer competencies

I have been asked before about describing my role as a UX architect, and I was thinking about the background of people working in UX design as being either graphic/visual design, software engineering/development or research (or a combination thereof).

With so much overlap between terms and definitions as well as variations of job titles, I wonder whether it is easier to present UX competencies in terms of the balance or skills of an individual in each of the three categories?

It might also give the HR people a clearer understanding of an already abstract and complicated area of work.