Multi-channel Notification Server

Tasks

• •Designed and built an independent notification server from scratch to integrate channels such as KakaoTalk, SMS, app push, and Slack, consolidating notification logic scattered across backend and PHP into Java/Spring
• •Configured an SQS-based event-driven architecture with DLQs to process bulk sends without notification loss
• •Designed enum-based channel routing and a client SDK to minimize registration points when adding new notifications
• •Built an annotation-based SDK using Java Reflection to map notification template variables to object fields automatically
• •Added back-office features and menus for managing notification messages and sending settings
• •Achieved 0% duplicate sends with Redis Lock idempotency checks and reduced Kakao notification cost by 10% through deduplication
• •Implemented AWS DynamoDB-based history management and per-user scheduled notifications

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