A web app with node js, express, mongodb on backend and front end on jquery, jqueryui and kendoui/other jquery plugin for data grids and more

Part 1 : Back end database design and api writing - We have some data structures/schema for about 7 tables that you will implement in mongodb and then write rest web api (JSON based) for CRUD and other operations. Only authenticated users should be allowed access to the data via this rest api - so we need you to develop a good authentication system too for securing the back end as well the front end described in part 2 below. You could use keycloak or other 3rd party authentication services too for this instead of developing the entire auth system from scratch. Part 2: Front end in jquery and its plugins Most of our front end (around 85% or more) will be in the form of data grids where users can enter new records and view them - including records in child tables too. We have kendo ui or other jquery plugins in mind to achieve it quite easily. The data source for the grid elements would be the json received by the api end points written by you in part 1 above. Some of the front end also requires accessing third party APIs of various courier companies to gather data and present it to users along with the data in our own databases. Some business logic requires automatic sending of sms and email messages at certain stages and triggers. This can be done via twilio api and other apis that we will give you api keys for.