Comprehensive Online Test Platform Development

I'm seeking an experienced developer to create a fully optimized, interactive online test platform.

Key Features:
- User Authentication: Secure login system for users
- Test Library & Uploading System: Easy access to a wide range of tests and ability to upload new ones
- Pricing Model Integration: Subscription-based system with various pricing tiers
- Digital Test-Taking Experience: Intuitive, smooth interface for an engaging test-taking experience
- Progress Tracking & Feedback: Real-time tracking of user progress with instant feedback
- Study Resources Integration: Incorporation of video tutorials as supplementary study resources
- Mobile Optimization: Platform fully optimized for all mobile devices
- Testing & Debugging: Rigorous testing and debugging to ensure a seamless experience
- Deployment & Setup: Complete setup and deployment of the platform

The ideal candidate should have:
- Proven experience in developing similar platforms
- Strong skills in mobile optimization
- Knowledge of integrating various pricing models
- Ability to incorporate multimedia resources into the platform
- Proficiency in testing and debugging

Please include examples of similar projects you've completed in your proposal.