Xccui developed a new feature for the apache/flink repository, enabling HybridSource to support pausing and resuming splits within streaming pipelines. By implementing this functionality in Java, Xccui allowed operators to dynamically control data processing flows, manage backpressure, and coordinate maintenance windows without interrupting long-running jobs. The work focused on robust software development practices and included comprehensive unit testing to ensure code quality and maintainability. This enhancement addressed operational challenges in streaming environments by providing finer-grained control over data ingestion, ultimately improving the reliability and flexibility of HybridSource. The contribution demonstrated depth in both technical implementation and problem-solving.