Worked on the datahub-project/datahub repository to enhance the reliability of data ingestion processes by addressing a critical bug in dbt source freshness assertions. Focused on backend development and data engineering using Python, the work involved fixing the handling of null values in the error_after criterion to prevent parsing issues and ingestion failures. To ensure the robustness of this solution, comprehensive unit tests were added to validate the new behavior and guard against future regressions. No new features were released during this period, with efforts concentrated on improving system stability and reducing the risk of failures in data ingestion workflows.