Use widgets or sidebars per shortcode in the content area from pages/posts
I've found the easiest way of using this is to reference just the Widget name from wp-admin/widgets.php - eg
[widget name="Latest Repair"]
Combine this with some layout shortcodes, and you've got a complete page builder solution in every WordPress Page.
Notably the last improvement (class name to reference a widget) makes this a valuable addition to WordPress Multi-site as a CMS platform :)