As with the normal Google search, it is important to be included in the Google index in the first place, i.e. to ensure that Google is aware of the website or the job ad. After that, it is important to optimize the job ad (SEO) and work your way up to the top positions. Important for job ads are especially the job title, as well as a correctly deposited place of work. See also our article on the Optimization of job ads on Google for Jobs.