There are a few reasons why you might want to hire a Google Glass developer. First, if you're looking to develop an app for Google Glass, then you'll need someone with experience in developing for the platform. Second, Google Glass developers may also have experience in using the Mirror API, which allows you to create apps that can interact with the user's display. Finally, Glass developers may also be familiar with voice recognition and control, which could come in handy if you're looking to develop an app that uses these features.