During August 2025, Max Mustermann focused on backend development within the matomo-org/matomo repository, addressing a data reliability issue in campaign attribution analytics. He refactored the campaign name rendering logic in transitions events, replacing the use of CONCAT with CONCAT_WS in PHP to handle potential null values in referer_name and referer_keyword fields. This adjustment eliminated inconsistent campaign strings and improved the accuracy of downstream analytics. Max validated the solution through targeted tests and code review, ensuring robust data processing without regressions. His work demonstrated a thoughtful approach to backend reliability, leveraging his expertise in PHP and data handling.