Web app Trivia Game

Hi, want to build a trivia game like HQ Trivia but without the video streaming part. The game will be hosted at a set time with 12 questions. Each question has a timer of 10 seconds. At the end of the game, each player is ranked according to the number of questions answered and the time it took to answer in milliseconds.
The admin will initiate the questions live with a NEXT question button.
The system has 6 parts.
1. Signup(google) and login
2. Trivia part
3. Live chatting
4. Ranking
5. Awards
6. Admin Panel

In the admin panel, the admin can see all players, results, awarding system, set questions, and initiate questions live.

The UI and UX will be provided as a Figma file.
The system should be scalable and be able to handle up to 1 million users.
And most importantly the system should have zero lags. Every time a question is initiated all users should get it at the same time.

The project consists of;
1. Front end
2. Backend
3. Server side

At the end of the project, the system will be tested (stress, load etc.) and any bugs will be fixed.

Thank You!