Designed a distributed order-processing system using Java, Spring Boot, and Apache Kafka, decoupling order creation, inventory reservation, and payment processing through asynchronous event-driven workflows.
Implemented a Transactional Outbox pattern with PostgreSQL to prevent database updates and event publishing from becoming inconsistent, with idempotent consumers to safely handle duplicate message delivery.
Built Saga-based failure recovery with retry policies, dead-letter topics, and compensating transactions to handle partial failures across distributed services without relying on a global database transaction.
Configured Kafka partitioning, consumer groups, and offset management for scalable event processing, with Docker Compose, Prometheus, and Grafana for reproducible deployments and operational monitoring.
