Cron jobs for the CMS are located in:
/etc/cron.d/backoffice3
To edit them the user needs sudo permissions.
For the application specific scripts the user needs to be set to www-data
Example cron entries:
10 0 * * * www-data php /usr/local/www/transmatico.com/artisan notifications:articles-on-ads-expiration
5 0 * * * www-data php /usr/local/www/transmatico.com/artisan notifications:articles-on-expiration
1 0 * * * www-data php /usr/local/www/transmatico.com/artisan notifications:articles-on-publish
1 */2 * * * www-data php /usr/local/www/transmatico.com/artisan notifications:articles-assigned
3 0 * * * www-data php php /usr/local/www/transmatico.com/artisan notifications:articles-overdue
*/5 * * * * www-data php /usr/local/www/transmatico.com/artisan ftp:process 1