Emmi Rehn focused on strengthening backend reliability in the neicnordic/sensitive-data-archive repository, specifically targeting the ingestion pipeline and API error handling. Working in Go, Emmi addressed a dataset parsing issue by implementing robust error handling logic in both the SyncAPI and Ingest components. The solution included correcting an error message typo, ensuring the application returned immediately after unauthorized responses to prevent cascading failures, and enhancing observability by logging root causes while returning generic messages to clients. This work improved the clarity of error signals and debugging efficiency, demonstrating depth in backend development and a careful approach to error management and system resilience.