The WP Job Manager plug in great, however you may need to add custom excerpt function to the job descriptions (if you want something like a custom post slider of jobs displayed on your home page for example).
If this is the case adding this code to your functions.php file will add the excerpt text field to the bottom of the listings page:
add_action(‘init’, ‘my_custom_init’);
function my_custom_init() { add_post_type_support( ‘job_listing’, ‘excerpt’ ); }