Cosmin Mazilu contributed to the IP-A2-2025/Quizzy repository by building automation and governance features focused on improving contributor onboarding and code review processes. He implemented a GitHub Actions workflow using YAML to automatically greet first-time contributors on pull requests and issues, streamlining the onboarding experience and reducing manual effort. Additionally, Cosmin established code ownership governance by introducing a CODEOWNERS file, ensuring that DevOps approvals are required for changes and that code quality standards are maintained. His work leveraged CI/CD practices and code review automation, providing foundational improvements in repository management and process discipline over a focused two-month period.