Fix Power App Data Retrieval Issues

I need an experienced Power Apps developer to fix some structural errors in my project. The primary issue is with data retrieval, which is currently failing and impacting the app's overall functionality.

Key Requirements:
- Identify and resolve data retrieval failures in Power App
- Ensure seamless integration with SharePoint
- Test and validate all functionalities post-fix

Ideal Skills and Experience:
- Proficient in Power Apps and SharePoint integration
- Strong troubleshooting skills for functionality failures
- Experience with data connections and retrieval in Power Apps

Please provide examples of similar work done and ensure you have a solid understanding of Power Platform.