Rafsal Rahim enhanced the robustness and compatibility of virtualization infrastructure by developing and testing initdata handling features across the confidential-containers/cloud-api-adaptor and NVIDIA/kata-containers repositories. He expanded end-to-end test coverage for edge cases in Go, introducing new test cases and helpers to validate initdata scenarios, including empty bodies and missing annotations, which reduced regression risk in production. For the s390x architecture, Rafsal implemented architecture-specific initdata device support in the QEMU runtime, generalizing device number generation for CCW devices. His work demonstrated depth in system programming, test automation, and device driver development, addressing architecture constraints and improving deployment reliability.