Japan's fintech software market includes specialist development firms, financial IT providers, and large technology groups building systems for banks, securities companies, insurers, payment providers, and digital finance businesses. The companies below cover custom fintech development, banking platforms, financial infrastructure, payments, trading systems, cloud modernization, and related engineering services. The list includes Japan-based providers as well as an international fintech development partner suitable for cross-border projects.
1. Itexus
Itexus builds custom fintech software for banks, brokers, investment firms, fintech companies, and other financial services organizations. Its engineers work on digital banking, payments, digital wallets, and trading and brokerage systems. They also build wealth management platforms, lending solutions, and financial data products.
Itexus also handles fintech integrations, legacy modernization, AI implementation, DevOps, QA, cybersecurity, and ongoing support. It has experience with KYC and AML workflows, market data, broker connectivity, payment APIs, and regulated financial products. Japanese businesses that want an international development team for a cross-border fintech project may find it a good match.
Key Facts
- Best for: Custom fintech products and cross-border financial software projects
- Core services: Fintech software development, fintech apps, UI/UX, integrations, AI, DevOps, QA
- Specialization: Banking, trading, wealth management, payments, lending
- Project types: Digital banking, wallets, brokerage platforms, investment software, financial analytics
- Notable strength: Fintech-focused engineering for regulated and integration-heavy systems
Contact Information
- Website: itexus.com
- E-mail: moc.suxeti@ofni
- Facebook: www.facebook.com/itexus
- Twitter: x.com/ItexusSoft
- LinkedIn: www.linkedin.com/company/itexus
- Instagram: www.instagram.com/itexus.soft
- Address: 8, The Green, STE road, Dover, DE 19901, United States
2. Simplex
Simplex has worked with Japanese financial institutions since it was founded in 1997. It offers technology consulting, system design and development, operation, and maintenance, plus shared financial software services.
Simplex started out strongest in capital markets and has since grown into securities, banking, FX, and other financial services. It still builds financial technology today. Recent projects cover bond trading, securities systems, insurance platforms, and digital financial infrastructure.
Key Facts
- Best for: Complex financial platforms and capital markets systems
- Core services: IT consulting, systems development, operations, maintenance, SaaS
- Specialization: Capital markets and financial technology
- Industries: Securities, banking, insurance, financial services
- Location: Tokyo, Japan
- Notable strength: Full-cycle delivery from consulting through long-term system operation
Contact Information
- Website: www.simplex.inc
- Address: 19F Toranomon Hills Mori Tower, 1-23-1 Toranomon, Minato-ku, Tokyo 105-6319, Japan
- Phone: +81-3-3539-7370
3. Nomura Research Institute
Nomura Research Institute, commonly known as NRI, offers consulting alongside large-scale financial IT development. Its financial technology business serves securities, asset management, banking, and insurance. It takes on contracted system development and operational outsourcing.
NRI also builds and runs financial business platforms used across the Japanese market. These include securities back-office platforms, banking systems, investment management solutions, and settlement infrastructure, and NRI modernizes legacy systems too. Established financial institutions with complex operational and regulatory requirements are its natural clients.
Key Facts
- Best for: Large banks, securities firms, insurers, and asset managers
- Core services: Financial system development, consulting, managed services, SaaS
- Specialization: Financial business platforms
- Industries: Banking, securities, asset management, insurance
- Location: Japan
- Notable strength: Large-scale financial infrastructure and back-office systems
Contact Information
- Website: www.nri.com
- E-mail: pj.oc.irn@retsambew
- Address: Otemachi Financial City Grand Cube, 1-9-2 Otemachi, Chiyoda-ku, Tokyo 100-0004, Japan
- Phone: +81-3-5533-2111
4. NTT DATA
NTT DATA runs a large financial technology business in Japan. It serves banking, credit cards, insurance, securities, cooperative financial institutions, and payment infrastructure. Its projects include core banking environments, shared banking systems, interbank payments, customer-facing financial services, and digital finance platforms.
NTT DATA also makes tools and development frameworks built for financial systems. Its FINALUNA solution, for example, supports Java-based development of applications for financial institutions. Other services cover embedded finance and cloud-based infrastructure for regional banks.
Key Facts
- Best for: Enterprise banking and financial infrastructure projects
- Core services: Financial systems, application development, cloud, integration, managed services
- Specialization: Banking and payment infrastructure
- Industries: Banking, credit, securities, insurance
- Location: Tokyo, Japan
- Notable strength: Experience with business-critical Japanese financial infrastructure
Contact Information
- Website: www.nttdata.com
- Twitter: x.com/nttdata
- LinkedIn: www.linkedin.com/company/ntt-data
- Instagram: www.instagram.com/nttdata
- Address: Toyosu Center Building, 3-3-3 Toyosu, Koto-ku, Tokyo 135-6033, Japan
5. SCSK
SCSK develops, maintains, and operates systems for the Japanese financial sector. Its financial business covers banking, insurance, securities, and credit, as well as AML, SWIFT-related systems, and credit assessment.
SCSK builds both systems for individual clients and reusable development platforms. It also works on modernization through cloud-native and low-code development, APIs, DevOps, and AI-assisted software delivery. Organizations updating established financial technology will benefit from its mix of financial industry experience and enterprise system integration.
Key Facts
- Best for: Financial institutions modernizing complex enterprise systems
- Core services: System development, maintenance, operations, cloud, application platforms
- Specialization: Financial enterprise systems
- Industries: Banking, insurance, securities, credit
- Location: Tokyo, Japan
- Notable strength: Development and ongoing operation of financial systems
Contact Information
- Website: www.scsk.jp
- Address: Toyosu Front, 3-2-20, Toyosu, Koto-ku, Tokyo 135-8110, Japan
- Phone: +81-3-5166-2500
6. Future Architect
Future Architect, part of Future Corporation, provides IT consulting and system transformation, and financial services is one of its main areas. Its projects bring together business process analysis, technology consulting, architecture, and implementation.
The company has built banking solutions such as FutureBANK and the newer InfiniBANK initiative. FutureBANK draws on its experience with financial system reform and loan-related processes. Its projects for Japanese banks also include modernization and generative AI applications.
Key Facts
- Best for: Banks combining business transformation with system development
- Core services: IT consulting, system development, DX, architecture
- Specialization: Banking systems and business process transformation
- Industries: Financial services, retail, services
- Location: Tokyo, Japan
- Notable strength: Combining financial consulting with system implementation
Contact Information
- Website: www.future.co.jp
- Facebook: www.facebook.com/FutureCorporation.1989
- Address: Art Village Osaki Central Tower, 1-2-2 Osaki, Shinagawa-ku, Tokyo 141-0032
- Phone: 03-5740-5721
7. NEC
NEC builds financial technology and cloud infrastructure for banks and other financial institutions in Japan. It offers financial cloud services, open API infrastructure, risk detection technologies, sales support systems, and modernization services.
NEC Secure PaaS for Finance is built for financial institutions moving systems to cloud-native environments. It provides environments for applications, testing, operations, monitoring, and development, and meets security requirements of the Japanese financial sector. NEC fits large modernization and infrastructure programs better than small standalone fintech apps.
Key Facts
- Best for: Financial cloud modernization and enterprise infrastructure
- Core services: Cloud platforms, financial systems, APIs, AI, modernization
- Specialization: Secure technology environments for financial institutions
- Industries: Banking and financial services
- Location: Japan
- Notable strength: Financial cloud infrastructure and modernization
Contact Information
- Website: www.nec.com
- Address: 7-1, Shiba 5-Chome, Minato-ku, Tokyo, 108-8001, Japan
- Phone: +81-3-3454-1111
8. Fujitsu
Fujitsu has dedicated teams serving large banks, regional banks, credit unions, online banks, and securities organizations in Japan. It works on core systems, digital channels, infrastructure, security, analytics, and other technology for financial services.
The wider Fujitsu group also builds and maintains software made for financial institutions. Its published capabilities include financial software design, custom and package development, systems construction, and maintenance. Large organizations that need both application engineering and enterprise infrastructure will find a practical candidate in Fujitsu.
Key Facts
- Best for: Large-scale financial IT programs
- Core services: Financial software, system integration, infrastructure, security, analytics
- Specialization: Banking and securities technology
- Industries: Banking, securities, financial services
- Location: Japan
- Notable strength: Enterprise financial systems combined with infrastructure capabilities
Contact Information
- Website: global.fujitsu
- Facebook: www.facebook.com/FujitsuICT
- Twitter: x.com/Fujitsu_Global
- LinkedIn: www.linkedin.com/company/fujitsu
- Address: 4-1-1 Kamikodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, 211-8588, Japan
- Phone: +81-44-777-1111
9. Finatext Holdings
Finatext Holdings focuses squarely on financial technology. The company is headquartered in Tokyo and runs three main businesses: financial infrastructure, fintech solutions, and big data analytics.
Its fintech solutions business helps clients plan and build customer-facing web services and mobile apps. Its financial infrastructure business provides cloud-native systems for securities and insurance companies. The platform is also designed for API-based integration and embedded finance.
Key Facts
- Best for: Digital financial services and embedded finance projects
- Core services: Fintech development, financial infrastructure, web and mobile development, data analytics
- Specialization: Cloud-native financial infrastructure
- Industries: Securities, insurance, fintech
- Location: Tokyo, Japan
- Notable strength: Combination of front-end fintech development and financial infrastructure
Contact Information
- Website: finatext.com
- Facebook: www.facebook.com/finatext
- Twitter: x.com/Finatext
- LinkedIn: www.linkedin.com/company/finatext
- Address: Sumitomo RD Kudan Bldg. 9F ,1-8-10, Kudankita, Chiyoda-ku, Tokyo, Japan
10. Hitachi
Hitachi builds technology systems for Japanese banks, insurance companies, securities firms, and other financial institutions. Its financial engineering work covers mission-critical systems, modernization, digital channels, lending technology, and cloud-based financial services.
Recent published projects include development for Japanese banks using cloud and microservices architectures. Hitachi has also helped banks with digital lending workflows and customer-facing financial apps. It fits established institutions that are upgrading existing infrastructure while adding new digital services.
Key Facts
- Best for: Large financial institutions and modernization programs
- Core services: Financial system development, cloud, microservices, digital banking
- Specialization: Mission-critical financial systems
- Industries: Banking, securities, insurance
- Location: Tokyo, Japan
- Notable strength: Integration of established banking systems with newer digital services
Contact Information
- Website: www.hitachi.com
- E-mail: moc.ihcatih@qh.ofni.ri
- Facebook: www.facebook.com/hitachi.web
- Twitter: x.com/Hitachi
- LinkedIn: www.linkedin.com/company/hitachi
- Instagram: www.instagram.com/hitachi
- Address: 6-6, Marunouchi 1-chome, Chiyoda-ku, Tokyo, 100-8280 Japan
- Phone: +81-3-3258-1111
11. BIPROGY
BIPROGY builds banking systems and other technology for Japan's financial sector. Its financial software supports domestic and international banking operations, and it has built infrastructure for regional financial institutions.
One example is BankForce-NE, an international core banking system for institutions with complex foreign currency and international finance processes. With its long history in core banking development, BIPROGY suits established banks and financial organizations. Early-stage fintech teams that only want a lightweight consumer app are a weaker fit.
Key Facts
- Best for: Banking platforms and core financial systems
- Core services: Banking systems, system integration, financial infrastructure, operations
- Specialization: Core and international banking technology
- Industries: Banking and financial services
- Location: Japan
- Notable strength: Long-term experience with banking system development
Contact Information
- Website: www.biprogy.com
- Address: 1-1-1 Toyosu, Koto-ku, Tokyo 135-8560 Japan
- Phone: +81-3-5546-4111
12. Monstarlab
Monstarlab is a Tokyo-headquartered digital consulting and software development company with more development and business locations across Japan. It builds digital products, modernizes systems, sets up data infrastructure, implements AI, and transforms customer experience.
Its digital product teams build web applications, mobile products, business applications, prototypes, and MVPs. They also handle API integrations and ongoing product development. Monstarlab can suit financial businesses that want a Japan-based product engineering partner for customer-facing services or modernization.
Key Facts
- Best for: Digital financial products that require UX and software engineering
- Core services: Product development, modernization, AI, data infrastructure, CX
- Specialization: Web, mobile, and business applications
- Industries: Multiple industries
- Location: Tokyo and other locations in Japan
- Notable strength: Product strategy, design, engineering, and modernization under one delivery model
Contact Information
- Website: monstar-lab.com
- Facebook: www.facebook.com/corp.monstar.lab
- Twitter: x.com/monstarlab_inc
- LinkedIn: www.linkedin.com/company/monstarlab
- Address: 150-0012 Ebisu Prime Square Tower 4F, 1-1-39 Hiroo, Shibuya-ku, Tokyo
13. JSOL
JSOL provides system integration and digital transformation services to several Japanese industries, and financial services is one of its core markets. Its system integration teams run the full delivery process and combine custom development with enterprise platforms such as ERP systems.
Because of its financial-sector integration experience, JSOL fits banks and other organizations that need enterprise application development, integration, and modernization.
Key Facts
- Best for: Enterprise financial system integration
- Core services: System integration, enterprise software, DX
- Specialization: Business-critical enterprise systems
- Industries: Finance, manufacturing, distribution, services, public sector
- Location: Japan
- Notable strength: End-to-end enterprise system integration
Contact Information
- Website: www.jsol.co.jp
- E-mail: pj.oc.losj@ofnibew
- Address: Tokyo Head Office: KUDAN-KAIKAN TERRACE 1-6-5, Kudanminami, Chiyoda-ku, Tokyo 102-0074, Japan
Conclusion
The fintech software development companies in Japan serve very different parts of the financial technology market. The final choice should depend on the type of financial product, integration requirements, regulatory environment, existing technology stack, and the amount of ongoing engineering support required.