Worked on enhancing DNS security and test reliability across openwrt/packages and NixOS/nix repositories. Delivered a security and stability update for Knot Resolver in OpenWrt, addressing Denial of Service vulnerabilities, improving NODATA proof validation, and updating DNSSEC root trust anchors to maintain reliable DNSSEC validation. In NixOS/nix, improved the test suite for flake.lock parsing by standardizing JSON output using Shell scripting and Makefile, ensuring reproducible results across environments. Focused on build systems, CI/CD, and package management, the work emphasized automation, upstream integration, and robust testing practices to strengthen network security and maintainability for both community and enterprise deployments.