
der Kollege
colleague
A person you work with, especially in the same company or in the same department.
Mein Kollege aus dem Marketing hat mir bei dem Projekt geholfen.
My colleague from marketing helped me with the project.
colleague
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colleague
A person you work with, especially in the same company or in the same department.
Mein Kollege aus dem Marketing hat mir bei dem Projekt geholfen.
My colleague from marketing helped me with the project.

colleague
A person who works in the same professional field or in a similar position, but not necessarily at the same company.
Auf der Konferenz traf der Arzt viele Kollegen aus anderen Krankenhäusern.
At the conference, the doctor met many colleagues from other hospitals.

buddy
A colloquial, often friendly form of address for a man; buddy.
Na, Kollege, lange nicht gesehen!
Hey, buddy, long time no see!
'Kollege' (colleague) is an N-declension noun. This means it takes the ending '-n' or '-en' in all cases except the nominative singular. Learners often make this mistake.
Ich frage meinen Kollegen, ob er Zeit hat.
I'm asking my colleague whether he has time.
In a professional context, 'Kollege' (colleague) is often used with verbs like 'fragen' (to ask), 'helfen' (to help), or 'zusammenarbeiten' (to work together). Typical adjectives are 'nett' (nice), 'neu' (new), or 'ehemalig' (former).
Könntest du bitte einen Kollegen um Hilfe bitten?
Could you please ask a colleague for help?
In the meaning of 'Kumpel' (buddy), 'Kollege' is colloquial and used almost only as a direct form of address for a man. It expresses a relaxed, informal relationship.
Na Kollege, alles gut bei dir?
Hey buddy, everything good with you?
employee
Mitarbeiter and Kollege can both refer to someone from the professional environment. Mitarbeiter emphasizes belonging to a company or project and can suggest a hierarchical employment relationship, while Kollege usually highlights working together as equals. Choose according to the perspective you want to emphasize.

Der neue Kollege bespricht mit mir den ersten Arbeitstag.
The new colleague discusses the first day of work with me.
Die Leiterin bespricht mit ihrem neuen Mitarbeiter den ersten Arbeitstag.
The manager discusses the first day of work with her new employee.