Hello Cojocareanu,
First thing that I notice from your text is that the employee can only see its own account this is probably related to the security settings in your domain model on the entity and on the security setting in your app settings. So do a small check if everything is set appropriate to your project needs.
Then for your datagrid maybe you can switch to a datagrid2 you can then pass a parameter to your page with the users account and this parameter should be available then in your datagrid and you can set your xpath based on this.
Hope this helps