iPhone software development

We are looking for an experienced iPhone developer to enhance an existing parameterised reference app "engine" that can be used to implement a wide range of apps without having to program each one separately. The engine is driven by a set of parameters and data contained in a MySQL database. 18 apps using the engine are already in the iTunes app store including "The Cold War In An Hour". We have many other quite different apps in preparation. We have a set of enhancements already specified that we need to be implemented urgently. We believe that these would take a good iPhone programmer no more than 5 days to implement including time for familiarising themselves with the existing code to be enhanced. Two further sets of enhancements will be specified ready for the chosen programmer to move onto on completion of the first set. We anticipate this being an ongoing relationship with further projects to include enhancements, optimising the existing code, iPad version, new projects etc. We expect the selected programmer to have good practical experience of developing for the iPhone using Objective C and Xcode. You must be fluent in English -- written & conversational. You must have access to Skype for progress "meetings", briefings etc. Please bid for the initial set of enhancements at a fixed price. Please confirm when you would be available to start on the project.