There are many advantages to hiring a Google App Engine developer. They include:
Google App Engine developers have experience working with the Google App Engine platform. This means they can help you optimize your app for performance and scalability on the platform.
Google App Engine developers are familiar with the various services and APIs that are available on the platform. This can be helpful in integrating your app with other Google services, such as Gmail or Calendar.
Google App Engine developers can also help you take advantage of the various features of the platform, such as datastore indexing and task queues.