Cross-Platform Breathing Guide App

I am looking for a skilled Flutter developer who can develop a Breathing Guide App for both Android and iOS platforms. The purpose of the app is to help users improve relaxation, focus, and overall wellness through guided breathing exercises.

The app should include features like guided breathing sessions with animations, calming background sounds, daily reminders, and progress tracking. I want it to have a clean, modern, and user-friendly design that makes it easy for beginners as well as experienced users to follow.

Key features I would like to have:

Guided Breathing Sessions
Multiple Breathing Techniques
Animated Visual Guidance with inhale/hold/exhale indicators
Background Sounds & Themes
Progress Tracking & Statistics
Notifications & Reminders
User Onboarding

The app should be developed in Flutter for cross-platform compatibility, with Firebase as the backend.

I am looking for someone who has prior experience in building wellness, meditation, or fitness apps and can deliver high-quality work within a reasonable timeline.

If you are interested, please share:
Your portfolio or past Flutter apps

Note
I will review only the best proposals.

Thank you.