General Unix SysAdmin expertise - 18 years (with main area in SysArchitect/Security).
Can help You securing on max your 2 Ubuntu instances, which You use to run website in TOR network (in all levels, starting from OS system level and up till webservices/db level and Joomla CMS part).
All works will be fully documented at the finish, so you can use/do same in future.
All can be done within short timeframe, estimated clean time needed for all - 10 hours.
Regards.