It’s easy to change your Careers Site's URL. Just go to Company Settings > Careers Site:
At 'Address' you can pick a new URL for your Careers Site.
Click 'Save' when you are done. The Careers Site's URL should be changed immediately. If people visit your old Careers Site's URL, they will be redirected to this new URL.
How can I ensure Google is indexing my Careers Site?
All Google - or any search engine - needs is to encounter a link to any page in your Careers Site.
Most teams link to their Careers Site from their marketing site. Google can index your whole Careers Site starting with that link.
While you can submit your URL to Google directly, you don’t need to — Google regularly crawls the web to add new sites to its index.