It's a fact of life that you'll have to upgrade your Drupal installation and contributed modules fairly frequently. Your candidate should mention:

► backing up the site,

► putting it into maintenance mode

► downloading the new version of the module

► uncompressing it

► running update.php

► testing the site

► taking the site out of maintenance mode

Ideally, your candidate would also mention creating a development environment to minimize downtime. There is also a big difference between upgrading a module (process described above) and a Drupal minor version upgrade, which requires more careful patching. Drupal major version upgrades, which happen every couple years, are another can of worms entirely.