Interactive/interaction designers

  : people involved in the design of all the interactive aspects of a product

Usability engineers

  : people sho focus on evaluating products, using usability methods and principles

Web designers

  : people who develop and create the visual design of websites, such as layouts

UI designers

  : People experienced in user-centered design methodologies

UI design engineers

  : people who develop and model the end user experience, using task, workfolow analytic methods, and low and high level prototyping

Information architects

  : people who come up with ideas of how to plan and structure interactive products, especially websites

UX designers/architexts/researchers

  : people who do all the above but who may also carry out ethnographic field studies to research into users' needs and convert them into actionable results