Worked on the shopware/acceptance-test-suite repository to enhance continuous integration efficiency and test environment control. Developed a feature enabling selective execution of only changed test files in the CI pipeline, which reduced feedback time and improved workflow focus. Introduced the ATS_SKIP_CLEANUP environment variable, allowing developers to disable DataService cleanup during acceptance tests for more precise management of test states. These improvements were implemented using TypeScript and YAML, leveraging skills in CI/CD, environment configuration, and test automation. The work emphasized measurable process improvements, targeting faster debugging and more reliable test outcomes without introducing new bugs during the development period.