Mandatory fields

 
add_filter( 'submit_job_form_fields', 'custom_submit_job_form_fields' , 11);
 
function custom_submit_job_form_fields( $fields ) {
 
 
    $fields['job']['job_location']['required'] = true;
    $fields['job']['job_tags']['required'] = true;
 
    return $fields;
}