Build a Udemy like Website & Mobile App

Hi there, My name is Rowan and I am a front-end UX design/developer. I am seeking a Software/Mobile App Developer to build a platform similar to Udemy. Ideally to accomplish would need skills in some modern frameworks to be ahead of the game but not essential. Here is Udemy's Tech Stack -[login to view URL] Recommendations on software stacks to use would be great. The app will be slightly different to Udemy - it will be a niche specialised service. It will have students - login/register as a student to purchase training programs. One of the major differences is the teachers/course content will be managed by us - it will have a set of specialised training programs that we will upload & manage. So there will be no need for teachers/instructors to register/login etc. Infrastructure wise I would like this to be able to handle unlimited students. I have had a look at "EdX" but it seems to only be able to handle upto 300,000 students. Be good to get recommendations/assistance on infrastructure. I do have some experience in configuring and deploying sites AWS test & production environments. Developer would upload to a private GIT repo for us to collaborate & receive final product would be great. I can provide wireframe prototype designs & manage the front end/css side. The developer would provide me some instructions/training on the app for myself to manage some parts of the app. Thank you. Please send me any questions.