Need java and ios obj c updates in my mobile app.

Hello! I am in need of some updates to my mobile application. Specifically, I am looking for modifications to existing features written in Objective C. The complexity of the updates is moderate. The freelancer I choose should have solid understanding of Objective C and how to develop mobile applications. I am looking to get these updates done in a timely fashion to ensure my application is up to date. Thank you in advance for your help!