Hi Mimisole the platform is multitenant with each app isolated in its workpsace, with profile and permissions sets you can specify user permissions up to the field level.
We haven't implemented the batch data import functionality yet but the only limitation we will have is the batch size. You can insert data one at a time for now.
We are currently in beta. you can try to create a small example Backoffice app on the platform to try out what we offer and if it suits you.
if you need any help setting up your workspace or have any questions we are on discord.