Julian focused on improving build reliability and reproducibility for the runtimeverification/evm-semantics repository by addressing a critical issue in the CI/CD pipeline. Using Nix and leveraging expertise in build systems, Julian implemented a targeted bug fix that ensured deterministic Cachix builds across different environments. This was achieved by aligning the build inputs used by both the CLI and Nix flake, specifically by including the /tests/ethereum-tests and /web/k-web-theme submodules in the build process. The result was consistent artifact delivery and reduced environment-specific variability, which streamlined debugging and enhanced release readiness. Julian’s work demonstrated depth in CI/CD and Nix workflows.