David Christopher - Expert React Native and Unity Developer for Ar App Optimization and Rebranding

We are seeking an expert React Native and Unity developer to optimize and rebrand our existing Augmented Reality (AR) application. The current application experiences significant stability issues with 3D objects, including scaling problems and position errors between users, sometimes up to 30 meters. Our primary goal is to achieve approximately 1-meter accuracy for 3D object positioning without requiring a complete rebuild of the existing React Native application.

The proposed solution involves integrating a Unity AR module into the current React Native application. This Unity module will be responsible for advanced camera management and high-precision AR positioning capabilities.

Required Features:
- Seamless integration of ARCore Geospatial API and Visual Positioning Service (VPS).
- Implementation of Cloud Anchors and permanent spatial anchors for persistent AR experiences.
- Development of sensor fusion and visual recognition techniques to minimize dependency on GPS for accurate positioning.
- Creation of a multi-user synchronized AR positioning system to ensure consistent experiences across all users.

Admin Mode Functionality:
- Ability to place 3D advertisements or objects in real-world environments using the device's camera.
- Tools to move, rotate, scale, and adjust the height of placed objects.
- Functionality to save spatial references, ensuring all users perceive objects at the same, correct location.

Testing Requirements:
- Verification that 3D objects do not 'slip' or drift during user movement.
- Confirmation of stable object size when users move closer to or farther away from the objects.
- Comprehensive testing with at least two users/devices simultaneously in the same physical location.
- Validation of accuracy and stability in both strong and weak VPS coverage areas.

Deliverables:
- A video demonstrating successful field testing and functionality.
- Complete React Native and Unity source code, including any necessary backend implementation.
- Production-ready apk/aab files for android.
- Basic setup and deployment documentation.