Event-driven order processing

Redesigned an order fulfillment pipeline from a nightly batch process into an event-driven system using Kafka and Spring Cloud Stream, cutting order-to-fulfillment time from hours to seconds and making the system resilient to partial failures.

Highlights

• —Reduced order processing latency from ~6 hours to under 30 seconds
• —Zero data loss during a full regional failover drill
• —Introduced schema registry and contract testing across five teams