During November 2024, Mathieu Chretien focused on backend development for the PubMatic-OpenWrap/prebid-server repository, addressing a critical bug related to bid request data integrity. He implemented a fix in Go to ensure the adunitcode field within the Prebid Impression extension is preserved during conversion, preventing loss of ad unit information and reducing the risk of misrouted bids. Mathieu updated the associated test coverage to validate this behavior and guard against regression. His work leveraged skills in API integration and data structures, contributing to improved compliance with Prebid specifications and maintaining the reliability of the bid request processing pipeline.