Fujitsu Limited and Sony Bank, Inc. have announced the integration of generative AI into the development of Sony Bank’s new core banking system, built on Fujitsu’s advanced core banking solution, starting September 2025. This initiative represents a strategic step toward an AI-driven development ecosystem within Sony Bank’s cloud-native environment.
In May 2025, Sony Bank completed a full cloud migration for all its systems by implementing a cloud-native core banking system powered by Fujitsu. This transition enhanced the flexibility, scalability, and overall efficiency of the bank’s operations, positioning it for advanced technological innovation.
Tatsuya Fukushima, Corporate Executive Officer at Sony Bank, commented: “Our goal is to deliver new value to our customers through technological innovation. We are excited to embark on this collaboration with Fujitsu, integrating generative AI into our core banking system development. This partnership isn’t just about efficiency and quality; it’s about unlocking more flexible and agile services for our customers. Merging our cloud-native environment with cutting-edge AI marks a significant leap forward in redefining the future of financial services.”
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Masaru Yagi, Corporate Executive Officer, SEVP, Fujitsu Limited, added: “Building on the successful delivery of the next-generation digital banking system in May, Fujitsu is proud to partner with Sony Bank on a strategic initiative that will apply generative AI to innovate system development. This undertaking marks the official launch of our vision for a truly AI-driven development ecosystem, centered on generative AI. By integrating Fujitsu’s AI expertise and business knowledge into Sony Bank’s operational core banking solution, we expect to significantly accelerate their development and service delivery.”
Initiative Overview
The collaboration will initially focus on applying generative AI to the development and testing stages of Sony Bank’s core banking systems. Leveraging Fujitsu’s proprietary knowledge graph-enhanced RAG technology, which improves generative AI inputs by mapping relationships across large datasets, the initiative aims to enhance AI accuracy and efficiency.
Looking ahead, the partners plan to extend generative AI-driven development across all stages of the system lifecycle from management and requirements definition to operations and maintenance targeting a 20% reduction in development times. By fully leveraging AWS for all processes, the initiative ensures advanced scalability, robust security, and improved operational efficiency. The project aims to establish a sustainable development ecosystem, maximizing the capabilities of Fujitsu’s core banking solution and AWS integration to enable continuous quality improvement and accelerated delivery of banking services.