Comprehensive Document Management System Development

I need an efficient document management system tailored for administrators. The system should handle text documents, spreadsheets, and PDFs.

Essential functionalities include:
- Document search
- Version control
- Access permissions
- Tracking changes

Ideal Skills and Experience:
- Experience in developing DMS
- Strong database management skills
- Proficiency in implementing robust search and version control mechanisms
- Knowledge of access permission protocols

Looking for a detail-oriented developer to ensure security and efficiency.