Predefined webform configuration for specific content type
Yes, You can able to do it using admin UI.

Follow below instruction.

Add new field (boolean type) at webform content type.

Make this field as a checkbox.

Add "Entityreference" module

enable it

Create entityreference view using views UI for webform content type and add above created boolean field in FILTER CRITERIA  select operator > is one of "yes"

I have attached snapshot for views UI



Now edit manage field on job content type

Add new field on job content type give the name and select "Entity Reference" in data type.

Now select "select list" option for widget click on next button.

Next page will be shown Entityreference option at there you need to section "view" for the first drop down "Views: Filter by an entity reference view" and second "View used to select the entities" pick you entity reference view which you have created prviously and save it.

Snapshot for above description 



Now you will able to select created webform on job node.