Worked on the apache/flink repository to enhance the reliability of stateful workloads by addressing a restoration issue in Apache Flink’s ForStKeyedStateBackend. Focused on backend development using Java, the work involved implementing a fix to ensure the NamespaceSerializer is correctly updated during state restoration, which reduces errors when the serializer changes. Introduced a dedicated API method for updating the namespace serializer and complemented this with regression tests to verify correct behavior under serializer changes. Leveraged expertise in state management and Java to deliver a targeted bug fix, improving the stability and maintainability of Flink’s state restoration process.