Drupal, PHP, Javascript developer with sysadmin skills

We require a freelance developer who can perform maintenance and ongoing small feature development tasks for our Drupal CMS and related applications. This will be a freelance role paid on an hourly or retainer basis. You will need to be based in the UK and preferably within the M25 (or if not then be willing to travel to London for meetings if required). Your previous experience must include complex multi-component (sites, tools, and related applications or backends) websites. You must be a fully self-reliant developer who is capable of analysing, understanding, and then working on, complex applications. You will be working in an Agile-style environment with a team of; other remote developers, designers and writers, taking direction and task prioritisation from them and providing regular status updates. You must be used to working at a command-line level for system administration/configuration tasks, and not reliant on CPanel, Plesk, etc. Skills required (all strong level, 5+ years): Linux, Apache, mySQL, PHP, Drupal, HTML 4/5, CSS 2/3, Javascript, jQuery, XML. Skills required (medium to strong level, 3+ years): System administration, system/database and application performance optimisation, load balancing, high availability techniques, payment gateway APIs, social media APIs, Drupal theme and module development, caching, development for mobile devices, multithreaded and asynchronous programming techniques. Beneficial skills: Cloud virtualisation (EC2, Xen, Rackspace), Continuous integration practices, OAuth, Android, iOS, POP/IMAP. If interested then please indicate your hourly or day rate, geographical location, a definition of your level of skills for the above, and examples of previous work.