Document Repository App Development

I'm looking for an experienced developer to create a document repository application primarily for document storage and retrieval. The app should support PDFs, Word documents, and spreadsheets.

Key Features:
- Secure document storage
- Easy retrieval with search functionality
- Support for PDFs, Word documents, and spreadsheets
- User authentication and authorization

Ideal Skills and Experience:
- Proven experience in developing document storage applications
- Strong background in database management
- Expertise in implementing security protocols
- Familiarity with various document formats and handling

Please include relevant experience in your application. Looking forward to your bids!