Domokos Sarmany enhanced the ecmwf/downstream-ci repository by improving CI dependency management and configuration reliability. He enabled the CI build environment to source Python libraries directly, streamlining dependency management and reducing pipeline flakiness. Using YAML for configuration management, he addressed environment variable formatting for FINDLIBS_DISABLE_PACKAGE and resolved shell quoting issues to prevent parsing errors. These changes resulted in more deterministic and reproducible CI builds, leading to faster feedback cycles. Over the course of one month, Domokos focused on CI/CD and dependency management, delivering targeted improvements that increased the reliability and maintainability of the continuous integration process.