Marvin Zeising developed a reusable workflow template for the Staffbase/gha-workflows repository, focusing on improving CI reliability by identifying and reporting flaky tests. He implemented the template_flaky_tests.yml file using YAML, leveraging GitHub Actions and workflow automation techniques to allow other workflows to invoke the template with configurable inputs such as Slack notifications and repository details. Marvin also updated the CLA configuration and README documentation to guide contributors in adopting the new workflow. His work laid the foundation for broader cross-team usage, enabling more consistent monitoring of flaky tests and reducing CI noise, though the scope was limited to a single feature.