There are several reasons why you might want to hire a Scalatra developer. First, Scalatra is a relatively new web framework, so there may not be as many developers with experience using it. Second, because Scalatra is built on top of the Scala programming language, it can be difficult to learn for those who are not already familiar with Scala. Finally, because Scalatra is designed to be lightweight and efficient, it can be a good choice for projects that need to run quickly and smoothly.