Backend Architecture

Event-Driven Order/Invoice Microservice

A highly scalable microservice architecture utilizing Domain-Driven Design and the Outbox Pattern to guarantee reliable message delivery.

The challenge

In a distributed system, ensuring data consistency across multiple services without relying on slow distributed transactions (two-phase commits) is a major architectural hurdle. The client experienced dropped messages and inconsistent states during high-traffic events.

The solution

We redesigned the core order and invoice flow using an event-driven architecture. By implementing the Transactional Outbox pattern, we guaranteed at-least-once message delivery to Kafka/RabbitMQ. We designed all consumers to be idempotent, ensuring that duplicate messages would not result in duplicate invoices or corrupted state.