During November 2024, Etienne enhanced two Virto Commerce repositories by delivering features focused on security and business logic. In vc-module-x-cart, he implemented cart promotions totals validation, ensuring that promotions are accurately calculated against the latest cart totals and updating unit tests to reflect this logic. For vc-platform, he added OpenID Connect identity provider capabilities, enabling the platform to serve as an identity provider with new authorization and token endpoints, while refining authentication flows and security headers. His work leveraged C#, ASP.NET Core, and OAuth 2.0, demonstrating depth in backend development and a strong focus on secure, maintainable solutions.