How to create a system for employee and employer using rbac rights?

How to create a system that would use employee and employer and also super admin. Is it enough to use default auth that comes with the yii framework or should i use any extension for it. If Yes what kind of extension i need to use. Please advise on this.

You should use RBAC:

http://www.yiiframework.com/doc-2.0/guide-security-authorization.html

Thanks for your help. I will read the documentation and start work on it.