What a strong Drupal specialist actually knows
Drupal is chosen when content structure and permissions are complicated. A strong developer models content types and taxonomies carefully, uses Layout Builder or Paragraphs for flexible pages, and writes custom modules with the service container instead of hacks in the theme.
They know configuration management, multilingual setup, editorial workflows and the headless option through JSON:API, and they keep security updates current because Drupal sites are often high-value targets.