[Azure Secure API Development](https://freelancer.com/projects/azure/azure-secure-api-development.ht

[Azure Secure API Development](https://freelancer.com/projects/azure/azure-secure-api-development.html) I need a production-ready REST API in Azure that lets our existing C# application reach an Azure SQL Database from anywhere, yet keeps the database completely off the public internet. The data involved is general business data, but the connection still has to be locked down. Authentication is two-layered. Human users must pass Microsoft Entra ID with MFA, while the application itself presents an API key on every call—no OAuth2 refresh tokens or certificates for this project. Every request must travel over TLS 1.2+ and be logged for audit purposes. The API will expose read, write and update operations. It must connect to SQL through a system-assigned Managed Identity; no connection s...