Hide server members of other members.

Here, let me explain the situation better:

I'm creating a server for the company I work for (It's a Software House), and all the company's employees will be on this server. Customers will also be on this server in the future, as I have added a Ticket system to support them.

There should be some way to hide certain members from these clients. In this case, among the employees will be the development and support team, I would like customers not to see the development team members in the member list, I would like only the members of the Technical Support role to appear for them.

Obs.: The rooms are already hidden for the client, it was only necessary to hide the development members, because it is not necessary for the client to be aware of these people and even to prevent them from calling the employee by private message.