C# SFTP Integration

I need an experienced C# developer to implement SFTP file upload functionality in my existing project.

Requirements:
- Upload .pdf and .doc files
- Read and write access to the SFTP server
- SSH encryption for secure file transfers

Ideal Skills:
- Proficiency in C#
- Experience with SFTP and SSH
- Strong understanding of file transfer protocols and security

Please provide relevant experience in your bid.