Admin needed for server running Debian and Ruby on Rails App

Hi, we have a Debian server running our Ruby on Rails application. Server also has mysql, ferret, svn, ssh installed. Also, apache is installed as a proxy to a pack of mongrels. Monit is installed for auto recovery. Furthermore, we use capistrano-ext to do deployments to our test server as well as our production server. We already have one server admin who set up both of our entire servers, but we need someone who is quick to respond to certain tasks that we need done quickly or in the case that our servers go down for one reason or the other. Main duties will include simple tasks as adding svn or ssh users, etc, and more importantly getting servers back up in the case they go down. Also, there might be some work involving writing backup scripts. Bidders should have experience with environments such as this especially with rails deployments, apache/mongrels, and capistrano. Biggest thing we need is for someone that is online (via skype, aim, or msn, etc.), that we can contact in the event of server going down. We can discuss terms of payment structure (hourly, task based, etc.) with whatever you feel comfortable with and that we determine to be fair.