Denial Haag enhanced the cda-tum/mqt-core repository by improving the determinism and auditability of its CI/CD workflows. He introduced templating improvements that pin the munich-quantum-toolkit/templates action to version 1.0.0 and lock it to specific commit hashes, ensuring reproducible builds and reducing deployment variance. By updating the YAML-based GitHub Actions workflow and adding clear in-code version comments, Denial provided a transparent audit trail for future reviews. His work focused on CI/CD reliability, leveraging skills in GitHub Actions and YAML to address the challenge of flaky releases and to streamline verification processes for ongoing and future software deployments.