Need a backend for a content calendar

Hello,

I need a backend, hosted on a web.

The backend has user-management and roles.
- Such as Admins and Freelancers.

What the dashboard in the backend will be after login:
1. is that it will show a list of articles/topics that will be published. The table can be sorted and will have the following columns; Topic, Author, Agency, Date to be Published, Status

2. The list of articles will be imported automatically from Google Sheets (the admins will configure this from specific URLs/sheets).

3. From the main dash. A freelancer can also post a topic and it will populate under the list of articles.

Thanks
Conrad