Worked on the spring-projects/spring-kafka repository to deliver a Flexible Share Consumer Acknowledgment Mode, introducing a syncShareCommits flag that allows users to select between synchronous and asynchronous commit options for share consumer acknowledgments. This feature was implemented in Java and leverages Kafka, focusing on enhancing throughput and processing flexibility for high-volume workloads. The development included comprehensive unit and integration testing to ensure reliability, with updates to legacy test references and documentation to support the new configuration. The work addressed end-to-end async commit durability scenarios, aligning with performance and reliability goals while maintaining robust integration testing practices throughout the process.