Amir Alperin focused on backend development and testing for the apple/container repository, where he addressed a networking configuration issue by refining port validation logic. He implemented a cross-protocol port validation fix in Swift, enabling the same port number to be used for both TCP and UDP without conflict. By updating the validation mechanism to be protocol-scoped, Amir aligned the system with real-world networking practices and reduced configuration errors. He thoroughly updated and added tests to verify the new behavior, ensuring backward compatibility and deployment flexibility. This work demonstrated careful attention to practical networking requirements and robust validation in Swift-based systems.