Update and Enhance 2012 iOS Productivity App

I have an iOS productivity application developed in 2012 that needs to be compiled with the current version of Xcode. The goal is to modify the app post-compilation.

Key Tasks:
- Compile the application with the latest Xcode
- Modify the application post-compilation
- Add new features to enhance functionality
- Identify and fix bugs
- Implement improvements for overall performance

Ideal Skills:
- Proficient in Xcode and iOS app development
- Experienced in UI/UX design for productivity tools
- Strong debugging skills
- Able to add new features to existing apps
- Excellent understanding of app performance optimization