SwiftUI Theme Toggle with Background App Optimization

I'm seeking a skilled iOS developer to enhance an existing app built with SwiftUI. The app currently allows users to toggle between light and dark themes and optimizes background processes by tracking screen timeout durations. I aim to refine the user interface and improve background performance, focusing on battery usage.

Key Requirements:
- Implement a minimalist design for the app's user interface.
- Ensure theme switching requires user confirmation for a seamless experience.
- Prioritize optimization of battery usage during background processes.
- Enhance foreground/background process management to boost app performance.

Ideal Skills and Experience:
- Proficiency in SwiftUI and iOS app development.
- Experience with UI/UX design, particularly minimalist aesthetics.
- Strong understanding of background process optimization, especially regarding battery efficiency.
- Ability to implement user-friendly features and transitions.

Your expertise will help create a more efficient and user-friendly app experience.