MySQL Login Database Integration

I need a professional freelancer who can integrate a MySQL login database into my existing source code. This project involves setting up a login system that can handle user authentication and potentially user roles and permissions, although I am not certain about the latter at this point.

Key Requirements:
- Integrate a MySQL database into my source code for user login.
- Potentially design for user roles and permissions, though this is still under consideration.
- Implement password strength validation for additional security.

Ideal Skills:
- Extensive experience with MySQL and database integration.
- Proficient in source code manipulation and software development.
- Knowledge of security features and user authentication systems.
- Able to provide advice on the necessity and design of user roles and permissions.