The dependencies argument of wp_enqueue_script() is case sensetive:
wp_enqueue_script('customjs', get_template_directory_uri() . '/js/paramo.js', array('jQuery'), '1.0.0', true);
That array('jQuery') needs to be array( 'jquery' ).
You can see the handles for bundled scripts on the documentation page for wp_enqueue_script():
https://developer.wordpress.org/reference/functions/wp_enqueue_script/