Abstract

Legacy core banking systems, which are for the most part monolithic and rigid, have come under increasing pressure to develop in order to be more agile and scalable in the high-speed financial world of today. In this paper a cloud-native modernization framework that uses AWS-based microservices to modernize legacy banking infrastructure is presented. The framework promotes DevOps best practices by breaking down monolithic applications into independently deployable microservices, improving operational reactivity and time-to-market for new features, and responding to the application demand at any given time. Leveraging AWS services including AWS Lambda, Amazon ECS, API Gateway, and DynamoDB, the model provides strong resilience, elastic resource management, and better security posture. The framework solves problems of data consistency, transaction management, and regulatory requirements in a decentralized environment. Experimental results also show that the support for system responsiveness, availability and maintainability is substantially enhanced. This research opens the door for banks to embrace agile cloud-native architectures, delivering innovation and customer-focused services for the digital future.