Japan Major SI Companies Complete Analysis: NTT Data, Fujitsu, NEC, Hitachi, NRI Compared

• 1. Japan SI Market Overview
  • 1.1 Market Size
  • 1.2 Major SIer Revenue Rankings
• 2. Detailed Analysis of Major SIers
  • 2.1 NTT Data
  • 2.2 Fujitsu
  • 2.3 NEC (Nippon Electric Company)
  • 2.4 Hitachi
  • 2.5 NRI (Nomura Research Institute)
  • 2.6 SCSK
  • 2.7 TIS
  • 2.8 Otsuka Corporation
• 3. Foreign-Affiliated SI Companies
  • 3.1 Accenture Japan
  • 3.2 IBM Japan
  • 3.3 Deloitte Tohmatsu
  • 3.4 Foreign vs Japanese SIer Comparison
• 4. Strengths by Industry Vertical
  • 4.1 Financial Services
  • 4.2 Government/Public Sector
  • 4.3 Manufacturing
• 5. Career Guidance
  • 5.1 SIer Selection Criteria
  • 5.2 Corporate Culture Comparison
  • 5.3 Interview Preparation
• 6. Future Outlook for Japan SI Industry
  • 6.1 Growing DX Demand
  • 6.2 Cloud-Native Transition
  • 6.3 Impact of Generative AI
  • 6.4 Accelerating Globalization
• 7. Conclusion
• References

1. Japan SI Market Overview

1.1 Market Size

The SI (System Integration) market holds a central position in Japan's overall IT market. The domestic IT market is estimated at approximately 26.6 trillion yen in 2025, with the information services sector (including SI and software) projected to achieve a high growth rate of 11.7%, driven by increased data center investment.

1.2 Major SIer Revenue Rankings

The revenue rankings of Japan's major SIers for FY2024 (fiscal year ending March 2025) are as follows:

2. Detailed Analysis of Major SIers

2.1 NTT Data

NTT Data is Japan's largest SI company and has grown into a global IT services provider.

Company Overview

• Official name: NTT DATA Group Corporation
• Founded: 1988
• Headquarters: Koto-ku, Tokyo
• Employees: Approximately 195,000 (consolidated)
• Revenue: Approximately 4.64 trillion yen (FY2024)

Strengths and Characteristics

• Dominant market share in government agency systems
• Strong position in financial services (banking, insurance, securities)
• Active investment in big data, AI, and IoT technologies
• Most globalized Japanese SIer with approximately 40% overseas revenue
• Reorganized as NTT DATA Group after integration with NTT Ltd. in 2023

Key Projects/Systems

• National Banking Data Communication System (Zengin System)
• Local government information systems
• Core banking systems for major banks
• My Number (national ID) related systems

Average Salary: Approximately 8.7 million yen

2.2 Fujitsu

Fujitsu is a representative maker-affiliated SIer that evolved from a hardware manufacturer into an IT services company.

Company Overview

• Official name: Fujitsu Limited
• Founded: 1935
• Headquarters: Minato-ku, Tokyo
• Employees: Approximately 124,000 (consolidated)
• Revenue: Approximately 3.55 trillion yen (FY2024)

Strengths and Characteristics

• Strong capabilities in cloud computing, AI, and IoT
• Developed the Fugaku supercomputer (achieved world's top performance)
• Serves broad range of industries including manufacturing, retail, and healthcare
• Operates proprietary cloud service "FUJITSU Cloud Service"
• Actively pursuing transformation into a DX company

Key Projects/Systems

• Fugaku supercomputer - achieved world's top performance
• Enterprise ERP and core systems
• Public sector digitalization projects
• Smart city initiatives

Average Salary: Approximately 8.8 million yen

2.3 NEC (Nippon Electric Company)

NEC possesses world-class technology in AI and biometric authentication, having originated from telecommunications infrastructure.

Company Overview

• Official name: NEC Corporation
• Founded: 1899
• Headquarters: Minato-ku, Tokyo
• Employees: Approximately 105,000 (consolidated)
• Revenue: Approximately 3.31 trillion yen (FY2024)

Strengths and Characteristics

• World's No.1 accuracy in facial recognition technology
• Global leader in biometric authentication systems
• Strong position in telecommunications infrastructure and network equipment
• Major role in government, defense, and space sectors
• Operates AI platform "NEC the WISE"

Key Projects/Systems

• Airport immigration facial recognition systems
• Submarine cable communication infrastructure
• Disaster prevention systems
• Smart city solutions

Average Salary: Approximately 8.4 million yen

2.4 Hitachi

Hitachi holds a unique position combining social infrastructure with IT solutions.

Company Overview

• Official name: Hitachi, Ltd.
• Founded: 1910
• Headquarters: Chiyoda-ku, Tokyo
• Employees: Approximately 270,000 (consolidated, IT division ~31,000)
• IT Division Revenue: Approximately 1.76 trillion yen (FY2024)

Strengths and Characteristics

• Strength in social infrastructure (power, transportation, healthcare) IT solutions
• DX business centered on IoT platform "Lumada"
• Unparalleled position in OT (Operational Technology) and IT convergence
• Aggressive global expansion (overseas revenue ratio exceeds 50%)

Key Projects/Systems

• Railway operation management systems
• Power grid management systems
• Healthcare information systems
• Smart factory solutions

Average Salary: Approximately 9.0 million yen (Hitachi parent company)

2.5 NRI (Nomura Research Institute)

NRI boasts high profitability with its unique business model combining consulting and IT.

Company Overview

• Official name: Nomura Research Institute, Ltd.
• Founded: 1965
• Headquarters: Chiyoda-ku, Tokyo
• Employees: Approximately 16,000 (consolidated)
• Revenue: Approximately 733.6 billion yen (FY2024)

Strengths and Characteristics

• Dominant market share in financial IT (securities, asset management)
• High value creation through consulting + SI synergy
• Industry-leading profitability with approximately 15% operating margin
• Numerous proprietary solutions and packaged products
• One of the highest-paying SIers in Japan

Key Projects/Systems

• Securities trading system "STAR" series
• Investment trust systems
• SCM solutions for retail
• Corporate management consulting

Average Salary: Approximately 12.7 million yen (industry's highest level)

2.6 SCSK

SCSK is a user-affiliated SIer under the Sumitomo Corporation group with a stable management foundation.

Company Overview

• Official name: SCSK Corporation
• Founded: 1969 (as CSK, merged in 2011 to form SCSK)
• Headquarters: Koto-ku, Tokyo
• Employees: Approximately 15,000 (consolidated)
• Revenue: Approximately 483 billion yen (FY2024)

Strengths and Characteristics

• Handles Sumitomo Corporation group IT while expanding external business
• Serves diverse industries including manufacturing, retail, and finance
• Frequently ranks high in "White Company" (good work-life balance) rankings
• Monthly average overtime of approximately 23 hours (low for the industry)
• Known for high paid leave utilization rate

Average Salary: Approximately 7.5 million yen

2.7 TIS

TIS is an independent SIer characterized by flexibility, not belonging to any specific corporate group.

Company Overview

• Official name: TIS Inc.
• Founded: 1971
• Headquarters: Shinjuku-ku, Tokyo
• Employees: Approximately 21,000 (consolidated)
• Revenue: Approximately 550 billion yen (FY2024)

Strengths and Characteristics

• Strong position in payment systems
• High market share in credit card and electronic money systems
• Active overseas expansion (ASEAN region)
• Group management as TIS INTEC Group

Average Salary: Approximately 7.2 million yen

2.8 Otsuka Corporation

Otsuka Corporation has a unique positioning specializing in IT solution sales for SMEs.

Company Overview

• Official name: Otsuka Corporation
• Founded: 1961
• Headquarters: Chiyoda-ku, Tokyo
• Employees: Approximately 9,400
• Revenue: Approximately 950 billion yen (FY2024)

Strengths and Characteristics

• Over 300 sales/service locations nationwide
• Specialized in supporting IT adoption for SMEs
• One-stop provision of copiers, PCs, and software
• Operates proprietary cloud service "Tayoreru"
• Known for exceptionally strong sales capabilities

Average Salary: Approximately 8.7 million yen

3. Foreign-Affiliated SI Companies

3.1 Accenture Japan

The Japanese subsidiary of the world's largest consulting/IT services firm.

• Japan employees: Over 20,000
• End-to-end coverage from strategy consulting to IT implementation
• High compensation (average ~9 million yen, managers 15M+ yen)
• Performance-based, Up or Out culture
• Currently hiring at scale due to surging DX consulting demand

3.2 IBM Japan

The Japanese subsidiary of the historic IT industry giant.

• Japan employees: Approximately 16,000
• Long track record since the mainframe era
• Transitioning business focus to cloud (IBM Cloud) and AI (Watson)
• Strong customer base in financial services and manufacturing
• Average salary: Approximately 9.2 million yen

3.3 Deloitte Tohmatsu

The Japanese member firm of Big4 accounting firm Deloitte.

• Consulting + digital services provider
• Strong in governance/compliance due to audit firm origins
• Recently strengthening digital transformation consulting
• Average salary: Approximately 9.4 million yen

3.4 Foreign vs Japanese SIer Comparison

4. Strengths by Industry Vertical

4.1 Financial Services

[Key Players in Financial IT]

Banking:
  - NTT Data (Zengin System, mega banks)
  - IBM Japan (legacy systems)
  - Hitachi (regional banks)

Securities:
  - NRI (dominant leader)
  - NTT Data

Insurance:
  - NTT Data
  - NEC
  - Accenture

Cards/Payments:
  - TIS (strong presence)
  - NTT Data

4.2 Government/Public Sector

[Key Players in Government IT]

Central Government:
  - NTT Data (dominant)
  - NEC
  - Fujitsu

Local Government:
  - Fujitsu
  - NEC
  - NTT Data

Defense/Space:
  - NEC
  - Mitsubishi Electric
  - Fujitsu

4.3 Manufacturing

[Key Players in Manufacturing IT]

Automotive:
  - Hitachi (Lumada)
  - NEC
  - Accenture

Electronics:
  - Fujitsu
  - NEC

Medical Devices:
  - Hitachi
  - Fujitsu

5. Career Guidance

5.1 SIer Selection Criteria

Key factors to consider when choosing a Japanese SI company for employment:

Prime Contractor (Motoke) Ratio

• Higher ratio means more involvement in upstream processes
• NTT Data and NRI have very high prime contractor ratios
• Small/mid-size SIers may have high subcontractor ratios - verify

In-house Solutions/Products

• Companies with proprietary products tend to have stronger technical capabilities
• NRI's STAR series, TIS's payment systems, etc.
• More technical growth opportunities than pure contract development companies

Work Environment

• Overtime: Industry average is 20-40 hours per month
• Paid leave utilization: SCSK is industry-leading
• Remote work availability: Significantly expanded post-COVID

Foreign Engineer Acceptance

• Foreign-affiliated companies are generally welcoming
• Large firms like NTT Data and Fujitsu are expanding global talent recruitment
• Smaller SIers tend to require higher Japanese language proficiency

5.2 Corporate Culture Comparison

5.3 Interview Preparation

Common interview questions and focus areas for Japanese SIers:

• Why SIer?: Why choose an SIer over a product/service company
• Why this company?: How the company's strengths align with your career
• Upstream experience: Requirements definition and design experience valued
• Communication skills: Client-facing ability is important
• Japanese level: N1 recommended, N2 acceptable at some companies
• Long-term commitment: Japanese companies value long tenure

6. Future Outlook for Japan SI Industry

6.1 Growing DX Demand

Driven by the establishment of the Digital Agency and DX promotion policies, demand for DX-related services from SI companies is surging. Projects for legacy system modernization, cloud migration, and AI/data utilization are increasing.

6.2 Cloud-Native Transition

The shift from on-premises SI to cloud-native development is accelerating. With increasing AWS, Azure, and GCP projects, SI companies are investing in cloud capabilities.

6.3 Impact of Generative AI

The emergence of generative AI is expected to transform SI business models. AI utilization is expanding in areas such as coding automation, test automation, and document generation, which will reshape the role of engineers.

6.4 Accelerating Globalization

Globalization of major SIers is accelerating with NTT Data at 40% overseas revenue and Hitachi at 50%+. This creates growing demand for global talent and expanding opportunities for international engineers.

7. Conclusion

Japan's major SI companies each possess unique strengths and characteristics. NTT Data's scale and government expertise, Fujitsu's technical capabilities, NEC's biometric technology, Hitachi's social infrastructure know-how, and NRI's financial specialization all represent clear differentiation points.

When considering employment or career moves, it is important to comprehensively evaluate how well a company's strengths align with your career goals, rather than focusing solely on revenue or salary. Additionally, consider the impact of technology trends such as DX, cloud, and AI on the SI industry to make forward-looking career decisions.

References

• Annual securities reports (Yuuka Shouken Houkokusho) and IR materials from each company
• IDC Japan - Domestic IT Market Forecast
• OneCareer - SIer Industry Research
• Geekly Media - SIer Rankings 2026
• Levtech Rookie - Major SIer Company Rankings