There are a number of reasons to hire a Yeoman developer. Firstly, Yeoman is a great tool for scaffolding web applications, so if you need someone to quickly set up the skeleton of your web app, a Yeoman developer would be ideal. Secondly, Yeoman developers tend to be very experienced with front-end technologies such as AngularJS and Gulp, so they can help you get the most out of these tools. Finally, because Yeoman is open source, there is a large community of developers who are always willing to help out and contribute code back to the project, so hiring a Yeoman developer helps support this great community.