We use Drupal to build sites, and we're very good at it. When we met Platform.sh a few years ago, we understood very quickly the benefits it could have on our day-to-day work. A few years later, all our development process are based around Platform.sh. It has saved us a huge amount of time and greatly accelerated our development cycle. From big site factories to small Drupal sites, we have migrated more that 100 sites on this technology, and we're loving it!