Minna Bank, Japan’s first fully digital bank, has taken a major step onto the global stage. Its cloud-native core banking system, built by Zerobank Design Factory and proven in live operations since 2021, will power MUFG Bank’s new digital bank – the first external deployment of the platform and a milestone for cloud-based banking in Japan.
When Minna Bank opened its digital doors in May 2021, it wasn’t just another entrant in Japan’s financial sector. It was something entirely new: the first Japanese bank built entirely in the cloud, designed for digital natives who saw no need for branches, paperwork or legacy processes.
The launch represented a bold experiment by Fukuoka Financial Group (FFG), a regional banking powerhouse that recognised a structural shift in customer behaviour.
The number of customers visiting traditional branches of the FFG decreased by 40% over the past 10 years, while the number of customers using Internet banking increased by 2.4 times over the same period,” said Koji Yokota, President of Minna Bank. The trend was clear: to remain relevant, FFG had to reinvent what a bank could be.
The result was Minna Bank – literally ‘a bank for everyone’– a financial services platform built not on bricks-and-mortar, but on code and the cloud. And now, less than four years later, that same platform is about to power one of the world’s largest banking groups. In a landmark move, Minna Bank announced that its full cloud-based core banking system, developed by its technology arm, Zerobank Design Factory (ZDF), will be provided externally for the first time. The recipient? None other than MUFG Bank, Japan’s largest financial group, which has selected the system as the core for its newly established digital bank.
For Kenichi Nagayoshi, CEO of ZDF and Minna Bank, the milestone validates years of investment and conviction. “Since our inception, we have accumulated and updated technologies and expertise required for a digital bank,” he said. “We believe the recent first external provision of our system marks a valuable milestone. Moving forward, we hope to contribute, even if just a little, to the development of the digital banking market both domestically and internationally.”
Reinventing the bank
The seeds of Minna Bank were sown when FFG launched iBank Marketing Corporation, a platform company tasked with exploring new models for financial services. Its app Wallet+, which blended banking with lifestyle services, attracted over 1.6 million downloads and hinted at a demand for digital-first, data-driven experiences.
But as Nagayoshi recalls, existing core systems weren’t fit for this new direction: “We looked all over the world for a suitable platform for a digital bank, but there was no banking system built in the public cloud – so we decided to create a full cloud bank ourselves.”
Together with Accenture, FFG embarked on building the Zero Bank Core Solution, a cloud-native, microservices-based, API-first system deployed on Google Cloud. The project required speed and agility; despite the pandemic, the team delivered in just 18 months.
“If it wasn’t for cloud, we would have been six months late in opening,” said Yokota. “Cloud’s scalability, speed of deployment and efficiency in fixing bugs are the reasons for the agility of our banking services.”
The system wasn’t just a technological upgrade – it was a paradigm shift. By leveraging Google Kubernetes Engine for scaling, Spanner for global data consistency and Vertex AI for insights, Minna Bank created a platform capable of evolving as fast as its users. The bank also orchestrated a multi-cloud ecosystem: AWS and Salesforce power customer service, Microsoft Azure supports employee operations and Oracle handles accounting.
Accenture’s role went beyond integration. “The adoption of a cloud-based and microservice platform bank system is one effective solution to address inefficiency and high costs in existing core systems,” said Masashi Nakano, Senior Managing Director, Financial Services, Asia Pacific and Japan, Accenture. “This innovative system significantly contributes to service growth, accelerates deployment speed and improves operational efficiency.”
Banking for digital natives
Technology alone doesn’t win customers – experience does. Minna Bank’s strategy centred on appealing to digital natives: consumers who expect frictionless design, daily utility and seamless blending of financial and non-financial services.
Instead of mass advertising, Minna focused on social engagement. Its app design emphasised clean graphics over dense text, making banking feel less like a chore and more like a natural extension of everyday life.
The result was a product that people actually wanted to use every day. “We are the first bank in Japan to truly integrate financial and non-financial data into a single service,” said Nagayoshi. That integration allows the bank not only to offer banking, but also to act as a portal for lifestyle services, creating value far beyond transactions.
The approach resonated. Today Minna Bank serves 1.3 million accounts, and its design ethos has been recognised globally. In 2021, it became the first Japanese company – and the first financial institution worldwide – to win ‘Brand of the Year’ at the Red Dot Design Awards, alongside additional honours for communication and identity design.
From bank to platform
From the start, Minna Bank wasn’t just about consumer accounts. Its business model rests on three pillars: direct B2C banking, embedded B2B2X banking-as-a-service (BaaS) via APIs and system provision to external institutions.
The MUFG deal represents the culmination of that vision. For the first time, ZDF’s core system will operate outside the FFG ecosystem, proving its scalability and adaptability. For MUFG, adopting a proven cloud-native system allows it to launch a new digital bank without the drag of legacy infrastructure. For ZDF, it demonstrates that a Japanese-built system can compete globally in a field often dominated by Western FinTech vendors.
“This system with its modular design and capability for partial integration offers versatile applications for banks, non-bank financial institutions and even non-financial entities,” says Accenture’s Nakano. “It is not just for banks, but for any organisation looking to embed financial services.”
For Google Cloud, the partnership highlights the role hyperscale infrastructure can play in regulated industries. “Our collaboration with Minna Bank reinforces that cloud-based technology can deliver flexibility, speed and reliability for core systems within global banks,” said Toby Brown, Global Managing Director, Regulated Industries, Google Cloud.
A signal for the industry
MUFG’s adoption of Minna’s system sends a clear signal: cloud-native banking has moved from experiment to enterprise. In one of the world’s most conservative financial markets, a system built in Fukuoka is now trusted by a global giant.
The implications extend far beyond Japan. As digital-native consumers reshape expectations worldwide, banks – and even non-banks – will need systems that can launch services quickly, scale elastically and integrate seamlessly into digital ecosystems. Minna Bank’s journey offers a blueprint.
“As Japan’s first digital bank, Minna Bank will be the epicentre of innovation in the Japanese financial industry,” said Accenture’s Nakano. “Accenture is committed to continuing to be an engine of innovation for Minna Bank.”
The future of ‘a bank for everyone’
Minna Bank’s story is still unfolding. From its origins as a regional experiment, it has become a case study in how cloud, design and partnerships can reimagine banking. Now, with MUFG as its first external partner, Minna and ZDF are poised to export that model domestically and internationally.
What began as a response to shrinking branch traffic in Kyushu has grown into a platform for global banking innovation. In a sector long defined by caution, Minna Bank shows what’s possible when bold vision meets cloud technology.
