Worked on stabilizing cross-architecture builds in the raexera/nixpkgs repository by addressing test failures for the InsightFace package under the Nix sandbox on aarch64-linux. Focused on build systems and cross-compilation, the approach involved disabling specific tests that accessed restricted system paths, which previously caused CI flakes and unreliable packaging. This targeted fix improved the reliability and portability of python312Packages.insightface across different architectures. Leveraged Nix and system packaging expertise to ensure that the package could be built and tested consistently, while also updating documentation to guide future testing strategies and prevent similar sandbox-related issues in ongoing development.