Designer Or Developer
And when you talk about design, it can be 3D, 2D as well. A good web engineer/ technologist must be all rounder. Otherwise developers can claim that design does not fit the accessibility and flexibility requirements of the website.
My opinion is to learn all that when you hit the web technology. All subjects relating to web are interrelated and connected in a way that a perfect harmony can not be established without good knowledge of all the things between design, development and animation. After all this is called as a web.