How to find a good web design agency?

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Web Site Developers
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• Web development is the work involved in
  developing a web site for the Internet or an
  intranet.
• In practice, many web developers will have basic
  interdisciplinary skills / roles, including
• Graphic design / web design
• Information architecture
• Mobile responsiveness

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• Testing Testing is the process of evaluating a
  system or its component(s) with the intent to
  find whether it satisfies the specified
  requirements or not.

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The term web design is normally used to describe
the design process relating to the front-end
(client side) design of a website including
writing markup. It is irrelevant with web
developer.