iPhone app writing and Wordpress website and CMS

We are looking for a person with experience(3-5yrs) in developing mobile apps on ios platform. We are developing a service app on an award winning idea on shopping and shipping. The app is complex as it has elements of location, chat, ecommerce, deliveries etc. We are experts in sales and shipping and we are looking for a partner who can lead the app development bit. We are on final stages of development done through outsourcing to app development companies. The person has to help us writing the code, testing, bug fixing, and fine tuning the app before launch and also assist us in solving day to day challenges after launch.