iOS App Refinement Expert Needed

I'm seeking an experienced iOS developer to refine and complete my app. It's built and ready to use, but needs enhancements in several areas.

Key Areas of Improvement:
- User Interface: Modernize and streamline for better user experience.
- Performance: Optimize speed and responsiveness.
- Functionality: Improve existing features and integrate external data (reports and lab data).
- Data Visualization: Enhance report generation and variability based on inputs.

Ideal Skills & Experience:
- Proficiency in iOS development (Swift, Xcode).
- Strong UI/UX design skills.
- Experience with data integration and visualization.
- Proven track record of improving app performance.

Please provide examples of similar work done. Looking forward to your bids!