Stephan Rayner developed secure CI/CD credential management and enhanced developer tooling across Grafana repositories, focusing on automation and usability. In grafana/crossplane-provider-grafana, he implemented Vault-based secrets management for artifact publishing, improving security and maintainability in CI workflows using Go and YAML. He iterated on project objective update commands, validating design choices through feature lifecycles. In grafana/unused, Stephan added a Makefile help target and introduced CSV output for the Unused Disk Reporting Tool, enabling both scriptable automation and interactive use. He also improved documentation quality and onboarding by refining Markdown READMEs, demonstrating depth in build automation, CLI, and technical writing.