Sarcouncil Journal of Engineering and Computer Sciences

Abstract: Event-driven architectures represent a paradigm shift in order management system design, addressing the limitations of traditional monolithic platforms in modern high-frequency trading environments. This article explores the transformation from legacy OMS architectures to cloud-native, microservices-based solutions that leverage asynchronous messaging patterns to achieve unprecedented scalability, resilience, and performance. Through the article analysis of architectural foundations, including message brokers, event streams, and design patterns such as Event Sourcing and CQRS, the article demonstrates how distributed systems can maintain consistency while processing millions of orders with sub-millisecond latency. The article explores cloud-native infrastructure components, particularly Kubernetes orchestration and service mesh technologies, that enable dynamic scaling and fault tolerance across distributed computing environments. The implementation issues, such as ordering of messages, the future consistency of the event, and latency optimization, are all solved with the help of the solutions that have already been tested in production deployment. Case studies in tier-one bank environments confirm the game-changing effects of event-driven systems and display the aspects of orders of magnitude improvements in throughput, availability, and operational agility without loss of compliance with regulation and system reliability.