Worked on the Netcracker/qubership-integration-runtime-catalog repository, focusing on backend development and API reliability using Java. Addressed a critical bug in the chain copy workflow by implementing a robust ID remapping mechanism, ensuring that copied chains and their referenced reuse elements receive unique identifiers. This approach prevents unintended sharing of references between original and duplicated chains, thereby enhancing data integrity and isolation within the runtime catalog. No new features were introduced during this period; the primary contribution was a targeted fix that reduces the risk of data corruption when duplicating chains, reflecting a careful and detail-oriented engineering approach.