During December 2024, Dmitry Borisov focused on backend development for the Artyom-Kitov/paketnik repository, addressing a critical data integrity issue. He implemented cascade deletion logic in Java and Kotlin, ensuring that when a file is deleted, all associated packet streams and unallocated packets linked by pcapId are also removed. This approach eliminated the risk of orphaned data and improved consistency across the packet lifecycle. By integrating cloud storage management and robust database handling, Dmitry’s targeted bug fix enhanced the maintainability and reliability of the backend, reducing future debugging and data cleanup efforts while demonstrating depth in backend engineering practices.