die Mitarbeit
collaboration
Active participation and involvement in a shared task, a project, or a company.
Wir danken allen für ihre engagierte Mitarbeit am Projekt.
We thank everyone for their dedicated collaboration on the project.

collaboration
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collaboration
Active participation and involvement in a shared task, a project, or a company.
Wir danken allen für ihre engagierte Mitarbeit am Projekt.
We thank everyone for their dedicated collaboration on the project.

The word 'Mitarbeit' (collaboration) is made up of the preposition 'mit' (with) and the noun 'die Arbeit' (work). It literally means being involved in work and taking part.
Ohne die Mitarbeit aller Kollegen schaffen wir das nicht.
Without the collaboration of all colleagues, we won't manage it.
'Mitarbeit' (collaboration) is an abstract noun and is almost always used in the singular. It describes the act of contributing in general.
Der Chef bedankte sich für die gute Mitarbeit im letzten Jahr.
The boss thanked everyone for the good collaboration over the past year.
To say what someone is collaborating on, you use the preposition 'an' followed by the dative. The structure is: die Mitarbeit an [etwas] (collaboration on [something]).
Die Mitarbeit an diesem Forschungsprojekt war sehr interessant.
The collaboration on this research project was very interesting.
The expression 'unter Mitarbeit von' (with contributions from) is a fixed phrase. You often find it in books, films, or reports to name the contributors.
Dieses Buch entstand unter Mitarbeit zahlreicher Wissenschaftler.
This book was created with contributions from numerous scientists.
employee
'der Mitarbeiter' and 'die Mitarbeit' look similar and belong to the same area of work or projects. The important difference is: 'der Mitarbeiter' is a person. 'die Mitarbeit' is the activity or participation in a shared task. So you can hire a 'Mitarbeiter', but ask for 'Mitarbeit'. Learners can easily confuse the words because both come from the verb 'mitarbeiten' (to collaborate / work together). Pay attention to the ending and the article: 'der Mitarbeiter' means the person, while 'die Mitarbeit' means the involvement or collaboration.

Für das Projekt brauchen wir die Mitarbeit des ganzen Teams.
For the project, we need the collaboration of the whole team.
Ein neuer Mitarbeiter hilft seit Montag im Kundenservice.
A new employee has been helping in customer service since Monday.