Tokyo has a substantial concentration of financial technology engineering expertise, ranging from specialist fintech developers to large system integrators supporting banks, securities firms, insurers, and payment providers. The companies below cover custom fintech applications, core financial systems, trading technology, payments, financial data platforms, cloud modernization, and related software engineering.
1. Itexus
Itexus focuses on custom fintech software for banks, brokers, investment businesses, fintech companies, and other financial organizations. It builds digital banking, wallets and payments, lending, wealth management, brokerage, and trading systems. It also works on financial analytics, KYC workflows, and integrations with financial infrastructure.
For Tokyo teams looking at an international engineering partner, Itexus fits projects that need fintech knowledge and full-cycle product development together. It also handles legacy modernization, AI implementation, cloud engineering, QA, product discovery, and team extension. Its current materials report more than 300 fintech projects for 250+ clients across 23 countries.
Key Facts
- Best for: Custom fintech products and complex financial platforms
- Core services: Fintech software development, fintech apps, AI implementation, cloud engineering, legacy modernization
- Financial areas: Banking, payments, trading, wealth management, lending
- Project types: Web platforms, mobile apps, enterprise financial systems, integrations
- Fintech experience: 300+ delivered fintech projects
Contact Information
- Website: itexus.com
- Email: moc.suxeti@ofni
- Address: Twarda 14, 00-824 Warszawa, Poland
- LinkedIn: www.linkedin.com/company/itexus
- Facebook: www.facebook.com/itexus
- Twitter: x.com/ItexusSoft
- Instagram: www.instagram.com/itexus.soft
2. NTT DATA
NTT DATA has its headquarters in Tokyo and a large banking and financial services technology practice. For financial organizations it covers banking modernization, payments transformation, lending, wealth management, and digital customer experiences. It also offers data and AI, enterprise architecture, and application operations. The company builds digital banking platforms and modernizes existing financial infrastructure instead of replacing it outright.
Its scale suits complex institutional programs better than small standalone fintech builds. NTT DATA reports more than 320 banking clients worldwide, backed by tens of thousands of professionals in the banking domain. The group headquarters is in Toyosu, Tokyo.
Key Facts
- Best for: Enterprise banking and large financial transformation programs
- Core services: Banking software, payments transformation, modernization, AI, application services
- Financial areas: Banking, lending, payments, wealth management
- Location: Koto-ku, Tokyo
- Project focus: Large-scale and business-critical financial systems
Contact Information
- Website: nttdata.com
- Phone: 800.745.3263
- Address: Toyosu Center Building, 3-3-3 Toyosu, Koto-ku, Tokyo 135-6033, Japan
- LinkedIn: www.linkedin.com/company/ntt-data-americas
- Facebook: www.facebook.com/NTTDATANorthAmerica
- Twitter: x.com/NTT_DATA_NA
- Instagram: www.instagram.com/nttdataplus
3. Nomura Research Institute
Nomura Research Institute, known as NRI, runs one of the most finance-focused IT businesses among Tokyo technology companies. Its Financial IT Solutions division serves securities, asset management, banking, and insurance. It combines contracted system development with managed services and financial business platforms.
NRI's experience runs deepest in capital markets and financial infrastructure. Its financial application services cover securities trading, investment management, and financial institution operations. The company is headquartered in Otemachi, close to many of Tokyo's major financial businesses.
Key Facts
- Best for: Financial institutions and capital markets businesses
- Core services: Financial system development, consulting, managed services, financial platforms
- Financial areas: Securities, banking, asset management, insurance
- Location: Chiyoda-ku, Tokyo
- Specialization: Large-scale Financial IT Solutions
Contact Information
- Website: www.nri.com
- Phone: 03-5877-7100
- Email: pj.oc.irn@retsambew
- Address: Otemachi Financial City Grand Cube, 1-9-2 Otemachi, Chiyoda-ku, Tokyo 100-0004
4. Simplex
Simplex has built its technology business around financial systems since the late 1990s. The Tokyo-based group handles strategy, consulting, design, software development, operation, and maintenance. It has long worked for securities companies, banks, FX businesses, and other financial institutions.
Financial engineering is central to its work. Simplex builds mission-critical capital markets systems and has expanded into banking, cryptoasset systems, cloud development for financial institutions, and financial SaaS. Its ISO 27001 registration covers software development and operation for FX, cryptoasset, and cloud systems that serve financial institutions.
Key Facts
- Best for: Trading, capital markets, banking, and complex financial systems
- Core services: Consulting, system design, software development, maintenance, operations
- Financial areas: Securities, banking, FX, cryptoassets
- Location: Minato-ku, Tokyo
- Specialization: Financial engineering and mission-critical systems
Contact Information
- Website: www.simplex.holdings
- Phone: +81-3-3539-7370
- Address: Otemachi Financial City Grand Cube, 1-9-2 Otemachi, Chiyoda-ku, Tokyo 100-0004, Japan
5. TISI
TISI took its current name in July 2026, after TIS and INTEC merged. The Tokyo company has deep experience in financial IT and payments, including systems for credit card businesses, banks, and other financial organizations. Financial IT remains one of the group's defined business segments.
Payments are a large share of its financial technology work. TISI provides PAYCIERGE and other payment services and also builds mission-critical financial systems. Its experience includes credit card processing infrastructure, debit payments, and systems that run financial institution operations.
Key Facts
- Best for: Payment infrastructure and financial IT
- Core services: Financial systems, payment technology, IT services, digital transformation
- Financial areas: Cards, payments, banking
- Location: Shinjuku-ku, Tokyo
- Current name: TISI Inc. since July 2026
Contact Information
- Website: www.tisi.jp
- Phone: +81-3-5337-7070
- Email: pj.isit.liam@ri-isit
- Address: Sumitomo Fudosan Shinjuku Grand Tower,8-17-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo 160-0023, Japan
6. SCSK
SCSK works across many kinds of enterprise technology, but finance is an established part of its system development business. Its teams have built systems for banking, securities, trusts, cards, insurance, and loans. Their work runs from application development to operation and maintenance.
SCSK has dedicated financial solution teams working on AML and SWIFT-related systems. It also builds software frameworks and applications for financial environments. Its wider services cover development, infrastructure, cloud, security, and managed services. Its main office is in Toyosu.
Key Facts
- Best for: Financial institutions needing development and long-term system support
- Core services: System development, maintenance, infrastructure, cloud, managed IT
- Financial areas: Banking, securities, payments, AML, insurance
- Location: Koto-ku, Tokyo
- Project types: Enterprise financial systems and supporting applications
Contact Information
- Website: www.scsk.jp
- Phone: +81-3-5166-2500
- Address: 3-chōme-2-20 Toyosu, Koto City, Tokyo 135-0061
7. BIPROGY
BIPROGY builds and runs enterprise systems from its headquarters in Toyosu. Financial services are a defined industry for the company. Its solutions cover core banking, branch systems, CRM, risk management, foreign remittance, and other bank operations.
The company has worked with financial organizations since the mainframe era. It combines its own software with system integration, cloud services, and outsourcing. Because BIPROGY both sells software and provides system services, it suits institutions that need financial products and custom system implementation from one firm.
Key Facts
- Best for: Banking systems and financial institution modernization
- Core services: Software development, system integration, cloud, outsourcing
- Financial areas: Core banking, remittances, CRM, risk management
- Location: Koto-ku, Tokyo
- Project focus: Enterprise banking infrastructure
Contact Information
- Website: www.biprogy.com
- Phone: +81-3-5546-4111
- Address: 1-1-1 Toyosu, Koto-ku, Tokyo 135-8560, Japan
8. Hitachi
Hitachi provides software and systems for financial institutions where availability, security, and long-term operation are critical. Its financial technology business covers core systems, modernization, migration, digital channels, lending processes, cloud services, and other areas of financial DX.
Recently it has built cloud-based tools that help financial institutions digitize customer interactions and change applications with low-code and CI/CD capabilities. Hitachi also keeps working on banking infrastructure and on modernizing legacy financial systems. Its headquarters is in Marunouchi, Tokyo.
Key Facts
- Best for: Mission-critical banking systems and modernization
- Core services: Financial systems, cloud modernization, migration, digital channels
- Financial areas: Banking, lending, financial infrastructure
- Location: Chiyoda-ku, Tokyo
- Specialization: Large-scale systems requiring high availability
Contact Information
- Website: www.hitachi.com
- Phone: +81-3-3258-1111
- Address: 6-6 Marunouchi 1-chome, Chiyoda-ku, Tokyo 100-8280, Japan
- LinkedIn: www.linkedin.com/company/hitachi
- Facebook: www.facebook.com/hitachi.global
- Twitter: x.com/Hitachi
- Instagram: www.instagram.com/hitachi
9. NEC
NEC's Digital Finance business combines software, AI, biometrics, payment technology, and banking platforms. Its financial solutions include digital banking technology through Avaloq, face-based payments, supply chain financing, and AI for financial operations.
The company also works on automated loan screening, fraudulent account detection, digital identity, and transaction security. NEC is a strong fit when a fintech project mixes financial applications with AI or biometric authentication, not just conventional app development. NEC is headquartered in Minato-ku, Tokyo.
Key Facts
- Best for: Digital finance projects combining software, AI, and identity technology
- Core services: Digital finance solutions, AI, banking technology, payments, biometrics
- Financial areas: Banking, payments, wealth technology, lending
- Location: Minato-ku, Tokyo
- Notable capability: Avaloq digital banking technology within the NEC Group
Contact Information
- Website: group.nec
- Address: 7-1 Shiba 5-chome, Minato-ku, Tokyo 108-8001, Japan
- LinkedIn: www.linkedin.com/company/nec-asia-pacific-pte-ltd
- Facebook: www.facebook.com/NEC.AsiaPacific
- Twitter: x.com/NEC_Australia
- Instagram: www.instagram.com/necaustralia
10. Future Architect
Future Architect is the main IT consulting and engineering company in Future Group. Based in Tokyo, it combines technology consulting with system architecture, development, and operation. Financial services are a dedicated business area, with teams working on financial systems and next-generation banking technology.
Recent banking projects include the InfiniBANK next-generation banking system. With Gunma Bank, it built a system that uses generative AI to improve loan operations. Future suits financial organizations that want consulting and software implementation in the same technology program.
Key Facts
- Best for: Banking transformation and custom financial systems
- Core services: IT consulting, architecture, system development, operations
- Financial areas: Banking, fintech, financial services
- Location: Shinagawa-ku, Tokyo
- Project focus: Custom enterprise systems and next-generation banking
Contact Information
- Website: www.future.co.jp
- Phone: 03-5740-5721
- Address: Art Village Osaki Central Tower, 1-2-2 Osaki, Shinagawa-ku, Tokyo 141-0032, Japan
11. DTS Corporation
DTS has built and maintained financial systems for more than four decades. It serves banks, trust banks, securities companies, credit card providers, and other financial organizations. Its development work ranges from account and information systems to market systems and external connectivity.
The company also takes on large system integration and reconstruction projects. Its published work includes major bank system upgrades, global bond systems, and securities core system modernization. It has also built card management platforms, credit screening, billing, merchant management, and financial infrastructure. DTS is headquartered in Chuo-ku, Tokyo.
Key Facts
- Best for: Banking, securities, and credit card system development
- Core services: System integration, software development, maintenance, infrastructure
- Financial areas: Banking, securities, cards, trusts
- Location: Chuo-ku, Tokyo
- Project types: Core systems, modernization, market systems, payment systems
Contact Information
- Website: www.dts.co.jp
- Phone: +81-3-3948-5488
- Address: 2-23-1 Hatchobori, Chuo-ku, Tokyo 104-0032, Japan
12. ITOCHU Techno-Solutions
ITOCHU Techno-Solutions, or CTC, supports financial organizations across the whole IT lifecycle. Its Financial Services Group works with banks, securities companies, insurers, and credit businesses. It handles planning, software development, infrastructure construction, cloud deployment, maintenance, operations, and outsourcing.
CTC also builds fintech and RegTech services and has released software for credit management, lending support, and capital markets operations. So it offers both custom development and packaged financial technology. Its headquarters is in Toranomon, Tokyo.
Key Facts
- Best for: Financial organizations needing full IT lifecycle support
- Core services: System development, cloud, infrastructure, consulting, maintenance
- Financial areas: Banking, securities, insurance, credit, capital markets
- Location: Minato-ku, Tokyo
- Specialization: Financial system integration and modernization
Contact Information
- Website: www.ctc-g.co.jp
- Phone: +81-3-6403-6000
- Address: Kamiyacho Trust Tower, 4-1-1 Toranomon, Minato-ku, Tokyo 105-6950, Japan
13. NS Solutions
NS Solutions, also known as NSSOL, runs a dedicated Financial System Solutions Bureau from its Tokyo headquarters. It builds and maintains financial applications. It also provides technology for derivatives, risk management, financial engineering, capital markets, and regulatory requirements.
Its financial work combines consulting, application development, data systems, financial packages, cloud services, and ongoing maintenance. NSSOL suits institutions with demanding risk, trading, lending, or accounting requirements more than consumer fintech apps alone.
Key Facts
- Best for: Capital markets, risk management, and financial engineering
- Core services: Consulting, system development, implementation, maintenance, IT services
- Financial areas: Banking, securities, derivatives, risk, lending
- Location: Minato-ku, Tokyo
- Specialization: Financial engineering and enterprise financial applications
Contact Information
- Website: www.nssol.nipponsteel.com
- Phone: +81-3-6899-6000
- Address: Toranomon Hills Business Tower, 1-17-1 Toranomon, Minato-ku, Tokyo 105-6417, Japan
14. CAC Corporation
CAC Corporation provides system development, integration, operations, and business process services from its headquarters in Nihonbashi, Tokyo. It has worked in financial services for decades, serving banks, securities businesses, insurers, and pension organizations.
Its application services cover planning, design, development, testing, implementation, and maintenance. In finance, CAC builds banking systems and securities platforms for clearing and settlement. That suits organizations that want one provider to stay involved after the first coding stage.
Key Facts
- Best for: Financial institutions seeking full application lifecycle services
- Core services: System development, integration, operations, managed services
- Financial areas: Banking, securities, insurance, pensions
- Location: Chuo-ku, Tokyo
- Project scope: Planning through development, implementation, and maintenance
Contact Information
- Website: www.cac.co.jp
- Phone: +81-3-6667-8000
- Address: 24-1 Nihonbashi-Hakozaki-cho, Chuo-ku, Tokyo 103-0015, Japan
15. NSD
NSD is a Tokyo-based system integrator with a large Financial IT practice. Its developers build systems for banks, trust banks, life and non-life insurers, securities firms, and credit card businesses. Projects cover both core financial systems and supporting applications.
For banks, NSD builds accounting, information, and market systems; for securities firms, information, sales support, and market applications. It also builds card member management, credit screening, billing, merchant management, and payment systems. Its wider software business includes IT consulting, system planning, design, development, and infrastructure construction.
Key Facts
- Best for: Banking, insurance, securities, and card software development
- Core services: IT consulting, software development, system design, infrastructure
- Financial areas: Banking, trusts, insurance, securities, credit cards
- Location: Chiyoda-ku, Tokyo
- Project focus: Core financial and payment systems
Contact Information
- Website: www.nsd.co.jp
- Phone: +81-3-3257-1130
- Email: pj.oc.dsn@retsam-bew
- Address: WATERRAS TOWER, 2-101 Kanda-awajicho, Chiyoda-ku, Tokyo 101-0063, Japan
Conclusion
Tokyo’s fintech software scene doesn’t just sit on the surface of Japan’s financial system-it runs through it. The city’s mix of deep banking heritage, dense technical talent, and a regulatory environment that has steadily opened up creates conditions that few other Asian hubs can match. Developers here work against a backdrop of real institutional demand rather than speculative hype, which tends to produce more grounded, durable solutions. The result is a market where local knowledge of compliance, payment culture, and enterprise needs still carries weight, even as global standards continue to shape the work.