Hi I can do this project. I have more experience in nextcloud,owncloud, only office,collabora server.
Already I did project like this to my Egypt Clint but not in freelancer.
But one thing is I want to know it's a collabora CODE or fully purchased collabora enterprise edition.
And I'm sure if you satisfied with my work then you'll make award to me else don't worry i don't want anything from your side.
Thanks.