Notification System - Frontend Angular 6 + Backend Node Express JS

Context: This is an existing project. Frontend application is up & running. Backend server is also there up and running. Most of the APIs needed are already there written in Node JS. What do I need? - End to end integration of [login to view URL] , redis, mongo, express js and angular 6. * On the front end: the UI has a basic( somewhat broken ) notification tray. The frontend has a basic integration of [login to view URL] which already works. You will need to make the notification tray work perfectly: 1. whenever a new notification arrives, the notification icon should have count incremented and shown. 2. When the user opens the tray, the count should go down. ( API is already there ) 3. The clicked and not yet clicked notifications should show in slightly different colors. 4. Clicking on a notification should take the user to a destination within the app. ( i have the exact list of 9 type notifications that are allowed on frontend ). Each type takes user to a specific place in the app. 5. On the application initial load, the app should fetch the latest 25 notifications. The notification count should only show the ones that the user has never seen. There will only be 25 notifications in the tray and no more. There will be a "See all notifications" at the end of the notification tray. User can click on it and go to a full new page which will have the latest 50 notifications. User can go all the way down and this page will have an infinite scroll to fetch older notifications until the user runs out of notifications. Some of the APIs for this are already working. * On the backend: - There are 2 types of notifications to handle. Organic and campaign based. - Organic notifications are generated when certain specific express routes are called from a different application. - Store notifications in redis cluster. ( AWS redis already setup ) - Only maintain latest 25 notifications in redis which will be shown on tray in frontend. - When the user will call the backend to get latest notifications on app load, get the notifications from redis and send it to frontend. - For organic notifications, when notification is called, first create a notification, persist it in Redis DB, then persist it in mongo db, then emit the notification to client on socket. Also, properly maintain all connected sockets in redis. If the user closes the browser and comes back the user should not have a stale socket connection or should not create a new connection. Handle this on backend as well. - For campaign based notifications, there will be super simple cron jobs that you need to run on Amazon. The cron jobs will search for specific types of record in mongo db and send out notifications. These notifications will follow the same path as organic notifications ( redis > mongo > frontend ). There are only 4/5 types of campaig based notification that we want to send. ---------------------------------------------------------------------------------------------------------------- I am technical myself and looking for a super technical person with detailed experience in Node JS/ Angular 6, [login to view URL], Redis and Mongo DB. I will provide you as many technical details as you will need ---------------------------------------------------------------------------------------------------------------- We use GitHub and you will have to use a provided GitHub account. ----------------------------------------------------------------------------------------------------------------