Calvin Fer focused on enhancing the CI workflow for the zio-dynamodb repository, targeting improved build stability and consistency across environments. He updated the GitHub Actions setup-scala action and explicitly configured Zulu JDK 17, ensuring that Scala builds run on a consistent and supported Java runtime. Working primarily with YAML and leveraging CI/CD best practices, Calvin addressed issues with flaky CI runs, accelerating feedback cycles and supporting developer productivity. While the work did not involve bug fixes, it demonstrated a methodical approach to infrastructure reliability, emphasizing maintainability and reproducibility in the build process over the course of the month.