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 develops custom fintech software for banks, brokers, investment firms, fintech companies, and other financial services organizations. Its engineering work covers digital banking, payments, digital wallets, trading and brokerage systems, wealth management platforms, lending solutions, and financial data products.
The company also handles fintech integrations, legacy modernization, AI implementation, DevOps, QA, cybersecurity, and ongoing software support. Its experience with KYC and AML workflows, market data, broker connectivity, payment APIs, and regulated financial products can make it relevant to Japanese businesses that need an international development team for a cross-border fintech project.
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 the company was founded in 1997. Its services span technology consulting, system design and development, operation, maintenance, and shared financial software services.
The company's roots are particularly strong in capital markets. Over time, its work has expanded across securities, banking, FX, and other financial services. Simplex remains active in developing financial technology, with recent projects covering 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, combines consulting with large-scale financial IT development. Its financial technology business covers securities, asset management, banking, and insurance, including contracted system development and operational outsourcing.
NRI also develops and operates financial business platforms used across the Japanese market. Its portfolio includes securities back-office platforms, banking systems, investment management solutions, settlement infrastructure, and legacy modernization services. The company is particularly relevant to established financial institutions with complex operational and regulatory requirements.
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 has a substantial financial technology business in Japan, covering 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.
The company also provides tools and development frameworks specifically designed for financial systems. Its FINALUNA solution, for example, supports Java-based development for financial institution applications, while other services cover embedded finance and cloud-based regional banking infrastructure.
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 provides system development, maintenance, and operational services for the Japanese financial sector. Its financial business covers areas including banking, insurance, securities, credit, AML, SWIFT-related systems, and credit assessment.
The company develops both customer-specific systems and reusable development platforms. SCSK also works on modernization and software engineering initiatives, including cloud-native development, low-code development, APIs, DevOps, and AI-assisted software delivery. Its combination of financial industry experience and enterprise system integration suits organizations modernizing established financial technology environments.
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 services with financial services as one of its main areas of expertise. Its work combines business process analysis, technology consulting, architecture, and implementation.
The company has developed banking solutions such as FutureBANK and the newer InfiniBANK initiative. FutureBANK draws on experience with financial system reform and loan-related processes, while the company's project portfolio includes modernization and generative AI applications for Japanese banks.
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 develops financial technology and cloud infrastructure for banks and other financial institutions in Japan. Its portfolio includes financial cloud services, open API infrastructure, risk detection technologies, sales support systems, and modernization services.
NEC Secure PaaS for Finance is designed specifically for financial institutions moving systems to cloud-native environments. It provides application, testing, operations, monitoring, and development environments while addressing security requirements relevant to the Japanese financial sector. NEC is therefore better suited to substantial modernization and infrastructure programs than small standalone fintech applications.
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 operations serving large banks, regional banks, credit unions, online banks, and securities organizations in Japan. Its work includes core systems, digital channels, infrastructure, security, analytics, and other technology supporting financial services.
The broader Fujitsu group also develops and maintains software specifically for financial institutions. Published capabilities cover financial software design, custom development, package development, systems construction, and maintenance. This makes Fujitsu a practical candidate for large organizations that need both application engineering and enterprise infrastructure expertise.
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 directly on financial technology and operates three main business areas: financial infrastructure, fintech solutions, and big data analytics. The company is headquartered in Tokyo.
Its fintech solutions business supports the planning and development of customer-facing web services and mobile applications, while its financial infrastructure operations provide cloud-native systems for securities and insurance businesses. The platform model is also designed to support API-based integration and embedded finance use cases.
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 develops technology systems for Japanese banks, insurance companies, securities firms, and other financial institutions. Its financial engineering work includes mission-critical systems, modernization, digital channels, lending technology, and cloud-based financial services.
Recent published projects include development work with Japanese banks using cloud and microservices architectures. Hitachi has also supported banks with digital lending workflows and customer-facing financial applications, making it particularly relevant to established institutions upgrading existing infrastructure while introducing 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 develops banking systems and other technology for Japan's financial sector. Its financial software portfolio includes systems supporting domestic and international banking operations, along with infrastructure developed for regional financial institutions.
One example is BankForce-NE, an international core banking system developed for financial institutions operating complex foreign currency and international finance processes. BIPROGY's longer history in core banking development makes it more relevant to established banks and financial organizations than early-stage fintech teams looking only for a lightweight consumer app.
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 additional development and business locations across Japan. Its services include digital product development, system modernization, data infrastructure, AI implementation, and customer experience transformation.
Its digital product practice covers web applications, mobile products, business applications, prototypes, MVPs, API integrations, and ongoing product development. The company can suit financial businesses that need a Japan-based product engineering partner for customer-facing digital services or modernization work.
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, with financial services included among its core target markets. Its system integration business covers the full delivery process and combines custom development with enterprise platforms such as ERP systems.
Its experience in financial-sector system integration makes it relevant to 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.