Build Online Learning Platform for a Single Teacher (Website + Android + iOS Apps)

I am looking for an experienced freelancer or small team to develop a complete e-learning platform for a single teacher. The platform should support both online and offline classes, provide a modern user experience, and include a website, Android app, and iOS app... (Budget: $750 - $1500 USD, Jobs: Android, API Development, App Development, HTML, iOS Development, Mobile App Development, PHP, Web Application, Web Development, Website Design)