Rahul Gupta developed the Marketing Notifications System for the nammayatri/shared-kernel repository, introducing a new MARKETING_EVENTS notification type to support targeted marketing campaigns. He extended the shared notification schema and updated interfaces and types to include the new category, ensuring consistent cross-layer mapping and integration. Working primarily in Haskell, Rahul wired the MARKETING_EVENTS type end-to-end through the FCM.hs layer, enabling seamless delivery to end users. His work focused on backend development and API integration, laying a foundation for future analytics and campaign features. The depth of the implementation reflects careful architectural planning and attention to extensibility across system components.