Giorgos Mantzounis enhanced the RedHatInsights notifications-backend by implementing granular subscription deduplication, addressing the challenge of duplicate notifications in event streams. He expanded the deduplication key to include service level and usage attributes, enabling more precise event differentiation and SLA-aware routing. Working primarily in Java, Giorgos focused on backend development and unit testing to ensure stability and maintainability throughout the release. His approach improved downstream processing reliability by reducing redundant notifications and supporting finer-grained event handling. Over the course of the month, he delivered this feature without introducing critical bugs, demonstrating careful attention to code quality and backend system robustness.