Scalable User and Course Management

I'm in need of a comprehensive user management system with the capacity to handle up to 1000 active users concurrently. The system should be efficient and scalable to maintain optimal performance as user numbers grow. The pivotal requirement I have is for the user registration process to be smooth and seamless.

Key Features:
- Scalable to over 1000 active users
- Role-based access controls for administrators, instructors, and learners
- User registration, profile management, and authentication with a focus on a seamless user experience
- Course management support, primarily for video tutorials
- Mobile accessibility, which is critical for this system

Ideal Skills:
- Experience in developing scalable web applications
- Proficiency in role-based access control systems
- Strong understanding of user experience design, particularly in user registration processes
- Prior experience in integrating mobile responsiveness into web applications, preferably with an emphasis on visual media like video tutorials