Web API to update database.

**Job Title:**
Development of a Secure Web Service with SQL Server Database Integration

**Description:**
We are seeking a skilled developer to create a high-security web service to be deployed within a corporate VPN. This API will be publicly accessible, securely connecting to an SQL Server database hosted on a separate local server. The API will run on a Linux OS and should be compatible with that environment. The awarded contractor will be responsible for setting up the service on-site, as well as conducting validation tests to ensure functionality and security.

**Requirements:**
- **Security-Focused**: The API should incorporate advanced security measures, including encryption, access control, and protection against SQL injection and other threats.
- **Database Management**: Integration with an SQL Server database on a separate local server, managing data transactions securely.
- **Linux Compatibility**: The service must be fully functional on a Linux operating system.
- **Installation & Testing**: The freelancer must handle the on-site installation and perform thorough validation tests.
- **Documentation**: Full technical documentation for API usage, error handling, and installation instructions.

**Additional Information:**
- **Project Scope**: Development, deployment, and validation of the API with database integration.
- **Required Skills**: Experience in secure API development, SQL Server, Linux systems, and network security.
- **Portfolio & Proposals**: Please provide examples of similar projects or proposals outlining your approach to this project.