Worked on the neoforged/NeoForge repository to enhance backend reliability by addressing a compatibility issue in the data synchronization pipeline. Developed the Sync Attachments Compatibility Guard using Java, ensuring that data attachments were not sent to clients lacking support for the SyncAttachmentsPayload type. This approach prevented incompatible payloads from being transmitted, reducing unnecessary network traffic and simplifying maintenance across mixed client versions. The solution improved overall stability for client interactions by resolving cross-version synchronization issues. The work focused on backend development, with clear traceability to the relevant commit and issue, and contributed to more efficient and reliable data synchronization processes.