Drupal is one platform in our toolkit for building web applications. Denver DataMan has been working with Drupal for three major iterations of the application and more than tens years.
We use and love Drupal because it is robust, powerful, easy to use (when configured well), and secure.
Our Drupal applications often integrate with other software and APIs. In one example we load a web-hosted PDF modification application directly in the browser allowing document modifications to be tracked and collected in the database.
We have done many Drupal marketing websites as well and understand the challenges faced with front-end theme design, SEO, and content marketing.