Some other severally mentioned coding skills were e.g. PHP, Flash and .NET. Generally speaking, if you know how to read the code, are familiar with programming principles and are able to make prioritized recommendations based on the findings, the rest will be easily picked up later on.
Experience of getting around in various content management systems was also desired by several (27) companies. The most commonly mentioned CMS in the list was WordPress, Magento , Drupal and Joomla.