Django

Django is a very powerful web framework which is free and open-source.
According to wikipedia : "Some well-known sites that use Django include Instagram, Mozilla, Disqus, Bitbucket, Nextdoor and Clubhouse". And the Django-powered Instagram got sold to Facebook for a billion dollars in 2012.
Django is one of the very few frameworks that has a backend interface for admin users to perform CRUD operations to the database. This should not be confused with a CMS like WordPress or Drupal where the backend interface can be used for the public users of the website.
It's been ~20 years since Django got launched, and it's still in very active development.
The development forum is super active where the community helps and replies to one's query in a short period of time. And to be frank, this is where we get most of our gyan.
Because of Django's intuitiveness, Launching a web project in Django for a quick short demo of the prototype or proof-of-concept can be achieved in a short period of time.
For those wanting a content powered, CMS-style system, we highly recommend wagtail as an alternative to WordPress. Even though wagtail was created in 2014, NASA and Google are users of wagtail.
wagtail's wagtail-vs-wordpress page has a comparision where it mentions "Developer skills are needed to set up and maintain a Wagtail website" whereas "Developer skills aren't needed to set up and maintain a WordPress website.". This may sound as a reason for not to use Django / Wagtail because you wouldn't seem to need a developer to maintain a WordPress site, but frankly speaking, with the number of attempts to hijack a WordPress site are so many in number, you would end up spending $$$ just for WordPress security. This wouldn't be the case in Django where hacking is almost unheard of.

We host our Django based applications on OpalStack and if cloud is a must, then on Google Cloud using App Engine.