Multi-Tenant Support in website

This is mini project where what you need to do is to create a small MEAN/MERN/MEVN project with only 1 form (Sign up form). User can sign up and in sign up form, they put their company name as one of the sign up fields (on top of the normal e-mail address and 2 password fields). Once we create a user account, we need to redirect the user to his "[login to view URL]" so the company name depends on what the user entered in the sign up form. Requirements: 1) Company name is unique (if user enters a company name which exists already, show error). 2) User Auth must be on that company tenant only (the one which they signed up on). If I am a user, I created "company1" I should have access to "[login to view URL]". Even after I have login token, I cannot access home page of [login to view URL] 3) Developer must provide working versions of this mini project on localhost (by sending code and I will test it) and also by hosting it on any cloud Paas (Amazon, Heroku...etc.) under a temporary app domain, so developer can show me it's working. If developer cannot host this on a Paas for technical reasons, they can deploy this project on my Windows VPS. Technical Requirements (MUST): 1) Backend: Node.js (backend to handle sign up request) 2) Frontend: You choose React.js or Angular or Vue.js (simple basic interface for sign up and a home page with company name as H2) 3) Database: Mongo DB (Store Company/user/token data) 4) Authentication: Middleware Express Auth using JWT