Hamzah Shakeel developed a robust HttpClient Authorization and Retry Mechanism for the DEFRA/epr-prn-rep-exp-facade repository, focusing on enhancing the security and reliability of outbound API requests. He implemented a DelegatingHandler-based authorization flow in C#, ensuring that outgoing calls include proper authentication, and integrated a Polly-based retry policy to handle transient errors gracefully. This approach addressed a missing authorization handle, reducing the risk of failed requests due to improper setup. Leveraging skills in API integration, HttpClient configuration, and resilience patterns, Hamzah’s work aligned the facade API with production security requirements and improved the robustness of external service communication.