Build a simple casting app for Andoid, Tizen and Apple TVOS

I am looking for a developer to build a casting app that will be available on Android, Tizen, and Apple TVOS platforms. Platform: - Android - Tizen - Apple TVOS Development: I am thinking that using a crossplatform development platform like Xamarin or Unity would work the best, however willing to listen to proposals for native apps as well. Product Requirements Document (PRD) for SynchHub Title: SynchHub 1. Introduction SynchHub is an application that enables users to cast and synchronize image content from a web service to multiple screens, tailored for Android TV OS, Tizen TV OS, and Apple TVOS. 2. Purpose To guide the development of SynchHub, emphasizing personalized content delivery via web service and synchronization across multiple TV OS platforms. 3. Scope This PRD outlines the integration and functionality of SynchHub for delivering and synchronizing content via a web service. 4. Requirements 4.1. User Interface (UI) • 4.1.1. Streamlined UI for ease of authentication and content management. • 4.1.2. Visual cues for connectivity and synchronization status. 4.2. User Authentication • 4.2.1. Support traditional username/password login. • 4.2.2. Enable browser-based code authentication linked to the user's account. 4.3. Content Management via Web Service • 4.3.1. Content retrieval from a user-specific web service endpoint after authentication. • 4.3.2. Automatic fetching and refreshing of content in alignment with the web service updates. • 4.3.3. Efficient content caching to enhance performance. • 4.3.4. Real-time content synchronization across all TVs logged into the user's account, ensuring that all screens display the same content simultaneously. 4.4. Device and OS Compatibility • 4.4.1. Compatibility with Android TV OS, Tizen TV OS, and Apple TVOS. • 4.4.2. Consistent feature set and performance across all supported platforms. 4.5. Image Casting and Display • 4.5.1. Casting support for JPEG and PNG. • 4.5.2. Adaptive resolution management for varying screen sizes. 4.6. Web Service Integration • 4.6.1. Secure RESTful API integration for content delivery. • 4.6.2. Provision of user-specific content, including images and related metadata. 4.7. Synchronization Across Devices • 4.7.1. Seamless image synchronization across all connected screens with minimal delay. • 4.7.2. Implementation of a buffering mechanism to account for network latency. 4.8. Security and Data Protection • 4.8.1. HTTPS protocol for secure communication with the web service. • 4.8.2. Compliance with best practices for data protection. 4.9. Performance and Testing • 4.9.1. Performance testing for content delivery and display load times. • 4.9.2. Synchronization accuracy testing under a variety of network scenarios. 5. Compliance and Standards • 5.1. Conformity with app store policies of each platform for the app's launch. The development of SynchHub will be steered by this PRD to ensure it delivers a user-focused, synchronized casting experience across multiple TV operating systems, leveraging a web service for personalized content management. Success will be measured by the app's synchronization capabilities, user experience, and adherence to security standards. Ideal Skills and Experience: - Experience in developing apps for Android, Tizen, and Apple TVOS platforms - Strong understanding of casting technology and protocols - Ability to implement specific features and functionality based on detailed requirements - Efficient and able to meet tight deadlines