Hi,
This is our company structure. We have client companies and we give the one or two people from client companies their login (users of client company). Within our company we have Project Managers who interact with the client company contacts and the developers and designers of our own company. However, the devs or the designers do not interact with the clients directly. the PMs are the people who interact with both the sides.
Currently, the clients can see all the people assigned to their projects - PMs, Dev, Designers etc and can assign tickets to them directly and can also see the comments made by the devs on tickets.
We need that the members of client companies do not see members of our company with the role "Developer" and "Designer" etc and any item (comments etc) posted by the "Developers" or "Designer" either. So that when the client company members log in they see only what they have posted or what the PMs have posted. Basically, we want to keep the Devs transparent to Clients.
How can we achieve this? Can you please help with a hack?

This is an EXTREMELY important requirement for us.