Tutoring & Learning Platform connecting Students, Tutors, Institute, Schools together

We are looking to buy only/not to develop from scratch. Any freelancer/Company that has developed a fully working system, fully responsive with Mobile Apps, and a video conferencing learning environment linked or to be linked with the main platform. Any system meeting our requirements below 80% - 100%, will be considered, please review the list of requirements first before bidding. Features: Platform preferred is .net but would not mind looking at php, Lavarel, Codeigniter, NodeJS, ExpressJS 1. Database - scalable to handle 1m+ users and at least 1m+ daily concurrent users 2. Security OWASP and secure/hardened for penetration with all or most of the below: Injection Broken Authentication Sensitive Data Exposure XML External Entities (XXE) Broken Access control Security misconfigurations Cross-Site Scripting (XSS) Insecure Deserialization Using Components with known vulnerabilities Insufficient logging and monitoring 3. Multiple language support 3. Search local/global - search by multiple data fields 4. Tutor 5. Students 6. Parents 7. Institute/Schools/Colleges/Uni 8. Login/Register interface 9. Profile creation 10. Scheduler/Booking - multiple timezones (local timezone converted to UTC) always display in end user timezone 11. Payment multiple currencies inbound/outbound (Inc Billing management) 12. LMS 13. Online Resources Library (Public/Premium Resources) 14. Online Blog/Forum 15. Learning Environment 1 to 1 video/voice conferencing Group 1 to many Recorded Videos 16. All videos and chat to be recorded 17. All web format to be responsive 18. Mobile App IOS/Android Video Conferencing Platform Create and Join meeting - this is to be linked with the main System Schedule Meeting Meeting History Rejoin from History Mute all participant Kick out participant you want Share screen Individual and group chat during a meeting 1 to 1 or unlimited group video Live Streaming Recording Raise Hand Whiteboard Online Quizzes/Polls or this could be part of LMS but integrated on Video Custom Paltform We look forward to hear from you if you have something like this developed and can sell to us.