Worked on enhancing the reliability of Kafka message processing in the m1a2st/kafka repository by addressing a critical bug in the ShareConsumeRequestManager component. Focused on backend development using Java and Kafka, the work involved correcting acknowledgement semantics to ensure all records are properly acknowledged during subscription changes. This fix closed a gap that previously risked missed acknowledgements and potential message reprocessing, thereby reducing the likelihood of data loss. By improving how piggyback acknowledgements are handled when subscriptions change, the update reinforced the stability and correctness of end-to-end message delivery for Kafka consumers, contributing to more robust backend operations.