Worked on the apache/nifi repository, focusing on backend development using Java to address a critical data integrity issue. The primary contribution involved fixing a bug in the LengthDelimitedJournal component, where rollback failures during journal updates could result in FlowFile duplication. By adjusting the journal update logic, the solution ensured that rollback operations no longer duplicated FlowFiles if an update failed, thereby enhancing the reliability of rollback behavior and maintaining data integrity. This work did not introduce new features but provided a targeted fix that strengthened the system’s handling of data consistency, demonstrating attention to robust backend engineering practices.