We are looking for someone who helps us to develop a web quiz app (web-based, like kahoot.com)

The teacher should present a question on his computer, and students should be able to answer the question on their smartphone.

The functionality will be not as complex as in kahoot, we will implement some basic stuff question types. Your duties will be to implement the backend-logic and frontend and to consult us. Design will be provided by us.

the main functionality of the app:
1) teacher can login and generate a quiz code, e.g. "3509"
2) the students can enter this code "3509"
3) then the teacher and the students are in the same "quiz room"
4) the teacher can select from different pre-made questions (video question, slider-question, text-answer).
5) then the students have to answer these questions
6) there will be an evaluation for every of these questions, how much people were right/wrong

the code that you provide should be nice written, the app should work with desktop screens and mobile screens. You should be available for changes.