Jannis contributed to the TryGhost/Ghost and TryGhost/Docs repositories by focusing on backend reliability and operational clarity. He addressed a versioning issue in the users API endpoint, removing the v1 prefix to align with ActivityPub standards and prevent 404 errors, updating both the API and its tests using JavaScript and TypeScript. In TryGhost/Docs, he enhanced manual backup documentation, detailing procedures for database and content folder backups across Docker and Ghost CLI environments. His work improved API interoperability and reduced support overhead by providing actionable, traceable solutions. Jannis demonstrated depth in API development, DevOps, and technical documentation within a short timeframe.