There are numerous reasons why Drupal is one of the top three most popular CMSs, and why hundreds of small to large complicated systems have chosen it.
Rootstack provides custom CRM software services focused on automating sales, marketing, and customer service business processes for healthcare, banking, real estate, and other industries.
Rootstack worked on a project that dealt with a separation of the backend and the creation of a signature queue process due to the size of the files so that the servers do not collapse.