Yes, a user can be in as many teams as you like, and they can have different permissions in each team. 

• For example: Jane is in both the fashion and beauty teams in Taxi as she works across emails for both departments. In the fashion team she has full permission to create, delete and edit projects and export mailings, but in the beauty team she is only able to edit mailings.   

Useful Links:
Users, Team Access and Permissions | How to create Users in Taxi | Admin & Non Admin Users | Managing Users | What are teams used for and how do they work? | Team vs Global Permissions

Did this answer your question?