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 heavily on custom fintech software for banks, brokers, investment businesses, fintech companies, and other financial organizations. Its development work covers digital banking, wallets and payments, lending, wealth management, brokerage products, trading systems, financial analytics, KYC workflows, and integrations with financial infrastructure.
For Tokyo-based teams considering an international engineering partner, the company is particularly applicable to projects where fintech knowledge is required alongside full-cycle product development. Itexus also handles legacy modernization, AI implementation, cloud engineering, QA, product discovery, and development team extension. Its current materials report more than 300 fintech projects delivered 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: Żurawia 6/12/lok 766, 00-503 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 combines a Tokyo headquarters with a large banking and financial services technology practice. Its work for financial organizations includes banking modernization, payments transformation, lending, wealth management, digital customer experiences, data and AI, enterprise architecture, and application operations. The company also develops digital banking platforms and works with existing financial infrastructure that requires modernization rather than complete replacement.
Its scale makes it more suitable for complex institutional programs than small standalone fintech builds. NTT DATA reports serving more than 320 banking clients worldwide, supported by tens of thousands of professionals working 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, commonly known as NRI, has one of the more finance-focused IT businesses among Tokyo technology companies. Its Financial IT Solutions division works across securities, asset management, banking, and insurance, combining contracted system development with managed services and financial business platforms.
NRI's experience is particularly deep in capital markets and financial infrastructure. Its financial application services support areas including securities trading, investment management, and financial institution operations. The company is headquartered in Otemachi, placing its consulting and development organization 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, with longstanding work for securities companies, banks, FX businesses, and other financial institutions.
Financial engineering is especially prominent in its work. Simplex develops mission-critical capital markets systems and has expanded into banking, cryptoasset systems, cloud development for financial institutions, and financial SaaS. Its ISO 27001 registration also covers software development and operation for FX, cryptoasset, and cloud systems serving 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 began operating under its current name in July 2026 after the merger of TIS and INTEC. The Tokyo company retains extensive experience in financial IT and payments, including systems used by credit card businesses, banks, and other financial organizations. Financial IT remains one of the group's defined business segments.
Payments are a major part of the company's financial technology work. TISI provides PAYCIERGE and other payment services while also working on mission-critical financial systems. Its experience includes credit card processing infrastructure, debit payments, and systems that support 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 a broad range of enterprise technology, but finance remains an established part of its system development business. Its teams have developed systems for banking, securities, trusts, cards, insurance, loans, and other areas of financial services, with capabilities extending from application development to operation and maintenance.
Current operations include dedicated financial solution teams working on areas such as AML and SWIFT-related systems. SCSK also develops software frameworks and applications used in financial environments, while its wider service model covers 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 develops and operates enterprise systems from its headquarters in Toyosu. Financial services are a defined part of its industry portfolio, with solutions spanning core banking, branch systems, CRM, risk management, foreign remittance, and other bank operations.
The company has worked with financial organizations since the mainframe era and combines its own software with system integration, cloud services, and outsourcing. Its corporate scope explicitly includes software development and sales alongside system-related services, making it a suitable option for institutions that require both financial products and customized system implementation.
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 supports financial institutions with software and systems designed for environments 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.
Recent development includes cloud-based tools that help financial institutions digitize customer interactions and modify applications using low-code and CI/CD capabilities. Hitachi also continues to work on banking infrastructure and modernization of legacy financial systems. The company 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 activities combine 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 applications for financial operations.
The company is also active in areas such as automated loan screening, fraudulent account detection, digital identity, and transaction security. This makes NEC especially applicable where fintech development involves a combination of financial applications and technologies such as AI or biometric authentication rather than conventional application development alone. 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 within Future Group. It works from Tokyo and combines technology consulting with system architecture, development, and operation. Financial services form a dedicated business area, supported by teams working specifically on financial systems and next-generation banking technology.
Its recent banking projects include the InfiniBANK next-generation banking system and work with Gunma Bank on a system using generative AI to improve loan operations. Future's approach suits financial organizations that want consulting and software implementation handled within 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 worked on financial system development and maintenance for more than four decades. Its financial business covers banks, trust banks, securities companies, credit card providers, and other financial organizations, with development experience ranging from account and information systems to market systems and external connectivity.
The company can also handle large system integration and reconstruction projects. Its published development work includes major bank system upgrades, global bond systems, securities core system modernization, 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, provides financial organizations with technology across the complete IT lifecycle. Its Financial Services Group works with banks, securities companies, insurers, and credit businesses on planning, software development, infrastructure construction, cloud deployment, maintenance, operations, and outsourcing.
CTC also develops fintech and RegTech services and has released software for credit management, lending support, and capital markets operations. This combination gives it coverage across 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, operates a dedicated Financial System Solutions Bureau from its Tokyo headquarters. The company develops and maintains financial applications while providing technology for derivatives, risk management, financial engineering, capital markets, regulatory requirements, and other complex financial functions.
Its financial work combines consulting, application development, data systems, financial packages, cloud services, and ongoing maintenance. NSSOL is particularly suitable for institutions with technically demanding risk, trading, lending, or accounting requirements rather than consumer fintech applications 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. Financial services have been part of its technology business for decades, covering banks, securities businesses, insurers, and pension organizations.
Its application services span planning, design, development, testing, implementation, and maintenance. Within finance, CAC works on banking systems as well as securities platforms that support areas such as clearing and settlement. This broad lifecycle coverage can suit organizations that want one provider involved beyond the initial 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 substantial Financial IT practice. Its developers work on 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.
Banking development includes accounting, information, and market systems, while securities work extends to information, sales support, and market applications. NSD also develops card member management, credit screening, billing, merchant management, and payment systems. Its broader 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.