Joomla Website Update & Extension Upgrade

I'm seeking a skilled web developer to help me update my Joomla website, including various extensions and Wikimedia, to their latest versions.

Key Tasks:
- Update the Joomla core and all extensions to the latest stable versions
- Ensure the Kunea Forum, Community Builder, JCE Editor, VirtueMart, Akeeba Backup, and other extensions are up-to-date
- Upgrade Wikimedia to its latest version

Ideal Skills:
- Extensive experience with Joomla
- Proficiency in upgrading and troubleshooting Joomla extensions
- Familiarity with Wikimedia

I'm looking for someone who can also ensure the website remains functional and secure after the updates.