In this pivotal project, I spearheaded the transition of FLEXCUBE's legacy codebase to a state-of-the-art, next-generation internet framework, adopting a microservice architecture. This ambitious endeavor required a comprehensive re-engineering of existing systems to harness the agility, scalability, and resilience offered by microservices. My contributions spanned the full spectrum of the migration process, from initial planning and architecture design to the meticulous execution of converting monolithic structures into a suite of independently deployable, modular services. This transformation not only modernized the FLEXCUBE infrastructure but also significantly enhanced its operational efficiency and adaptability to evolving digital banking demands.