SI SYSTEM
SI SYSTEM is a privately held Tokyo-based Japanese systems integrator providing on-site and commissioned Java/C# web-application development plus PMO consulting to enterprise clients in banking, insurance, securities, government, e-commerce, and aviation across the Greater Tokyo metropolitan area.
- Company typePrivate
- Founded2008
- HeadquartersTokyo, Japan
- Headcount11–50
- GTM typeB2B
- OfferingServices
What SI SYSTEM does
SI SYSTEM Corporation (SIシステム株式会社 / エスアイシステム株式会社) is a privately held Japanese information systems integrator founded in January 2008 by Representative Director Kenji Suematsu (末松健二) and headquartered in Taito-ku, Tokyo. The company provides two principal services: 常駐開発 (resident/on-site system development), which dispatches teams of engineers to client premises, and 受託開発 (commissioned system development), which delivers custom projects end-to-end from requirements definition through design, implementation, testing, and maintenance. Core technology is enterprise web-application development on a Java/C# stack using Struts and Spring frameworks, JSP and JavaScript front-ends, with Oracle and DB2 databases deployed on UNIX, WebLogic, and WebSphere application servers.
The company's customer base is concentrated in Japanese enterprise and government verticals — banking, securities, insurance, public sector, e-commerce, and aviation — where it emphasizes high-availability transaction systems and PMO/consulting support. Differentiators cited include PM/PL-class personnel, team-based delivery (5-10 person squads), long-running client engagements, and an internal training pipeline covering new graduates and career-changers. Service delivery is geography-restricted to the Greater Tokyo metropolitan area (Tokyo, Kanagawa, Saitama, Chiba).
The business model is professional-services revenue: billing is project- or time-based against client contracts; salary disclosures (entry ~232,375 yen/month, mid-level ~292,094 yen/month with bonuses averaging 4 months annually) indicate labor-cost economics typical of a Japan SI body-shop. The firm is privately held with no external institutional investors identified, having funded growth entirely through five internal capital increases from 3M to 98M yen between 2012 and 2022. Revenue is not publicly disclosed.
SI SYSTEM firmographics
Firmographics- Name
- SI SYSTEM
- Legal name
- SIシステム株式会社
- Website
- https://sinfo-sys.co.jp
- Company type
- Private
- Founded year
- 2008
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- SI SYSTEM is a privately held Tokyo-based Japanese systems integrator providing on-site and commissioned Java/C# web-application development plus PMO consulting to enterprise clients in banking, insurance, securities, government, e-commerce, and aviation across the Greater Tokyo metropolitan area.
- Ownership category
- akta.pro rank
SI SYSTEM industry classification
Industry- Product category
- IT System Development Services
- NAICS
- Computer Systems Design and Related Services (54151), Computer Systems Design Services (541512)
- SIC
- Services-Computer Integrated Systems Design (7373), Services-Computer Programming Services (7371)
- akta.pro primary industry
- Enterprise Architecture & IT Operating Model (BPAHAEAB)
Keywords
Where SI SYSTEM is headquartered
LocationHeadquarters
- HQ city
- Tokyo
- HQ country
- Japan
- HQ region
- Asia
Offices1 record
Markets served
SI SYSTEM business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- On-site System Development Services (常駐開発): Providing skilled engineers to work on-site at client locations, primarily in financial, insurance, and enterprise sectors. Engineers are deployed to client projects for extended periods.
- Commissioned System Development (受託開発): Custom system development from requirements gathering through to delivery, including web applications, DWH design/construction, and ongoing data mining services.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Monthly | New Graduate / Entry Level Engineer |
| Subscription | Monthly | Mid-Level Engineer (27 years, Section Chief) |
Go-to-market motion2 records
Distribution channels2 records
Marketing channels4 records
SI SYSTEM product offering
Product offeringCore offering
SI SYSTEM provides on-site IT engineer dispatch (システム常駐開発) and commissioned custom system development (システム受託開発) primarily for enterprise clients in financial services, insurance, securities, government, and e-commerce. The company's main business axis is web application development using Java and C# with Struts and Spring frameworks, covering the full lifecycle from requirements gathering through deployment, testing, and maintenance, including DWH design and data mining services.
Product overview
SI SYSTEM is a software development company offering a portfolio of system development services. The core offerings include System Resident Development (、常駐開発) — dispatching engineers to client sites — and System Entrusted Development (受託開発) — complete custom development projects. Web Application Development serves as the primary business axis, supported by consulting and PMO services. The company specializes in Java-based technologies for banking, insurance, and securities systems, while also providing data warehouse design, construction, and data mining services. Training and education programs support employee development across all service areas.
Differentiator
Problem solved
Functional benefit
Products and services
- System Resident Development (システム常駐開発) On-site system development services where engineers are dispatched to client locations to work on Java, C#, and web application projects. Specializes in banking, financial, and insurance systems requiring high transaction processing capabilities and stability. PM/PL class personnel available to lead 5-10 person teams.
- System Entrusted Development (システム受託開発) Custom commissioned system development from upstream requirements gathering through design, implementation, testing, and deployment. Includes DWH (Data Warehouse) design, construction, and data mining services as part of the total solution. Targeted at enterprises needing full-lifecycle development for web applications and e-commerce platforms.
- Web Application Development (Webアプリケーション開発) Main business axis offering web application development for clients, leveraging accumulated technical expertise across upstream requirements definition, design, programming, and testing phases. Uses Java, JSP, JavaScript with Struts and Spring frameworks.
- Consulting / PMO Services (コンサルティング・PMOサービス) Consulting services including business requirements analysis and vendor control for projects with tight budgets and schedules. PM/PL class personnel available for project management, budget management, schedule management, and vendor coordination. Includes PMO engagement support such as framework construction, performance improvement, and security response.
Quantifiable outcome
- Company has grown through multiple capital increases from 30M to 98M yen since founding
- +1 more outcomes
Companies that use SI SYSTEM
Customer profileNamed customers6 records
Segments4 records
Ideal customer profiles3 records
SI SYSTEM technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
SI SYSTEM partnerships and signals
Strategic signalScale indicators2 records
Recent moves11 records
Expansion highlights4 records
SI SYSTEM competitors and assessment
Company assessmentMarket position
Strengths4 records
Competitive moat3 records
Key risks7 records
Key highlights7 records
Customer concentration
SI SYSTEM financial estimates
Financial estimateRevenue estimate
Valuation estimate
SI SYSTEM leadership team
Management profileNumber of profiles
Profiles4 records
SI SYSTEM funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
SI SYSTEM M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about SI SYSTEM
What does SI SYSTEM do?
SI SYSTEM provides on-site IT engineer dispatch (システム常駐開発) and commissioned custom system development (システム受託開発) primarily for enterprise clients in financial services, insurance, securities, government, and e-commerce. The company's main business axis is web application development using Java and C# with Struts and Spring frameworks, covering the full lifecycle from requirements gathering through deployment, testing, and maintenance, including DWH design and data mining services.
Is SI SYSTEM a public or private company?
SI SYSTEM is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was SI SYSTEM founded?
SI SYSTEM was founded in 2008. It employs 11 to 50 people.
Where is SI SYSTEM based?
SI SYSTEM is headquartered in Tokyo, Japan, in the Asia region.
How does SI SYSTEM make money?
Two revenue lines are on record. On-site System Development Services (常駐開発) is the primary driver. The others are commissioned System Development (受託開発).
Does SI SYSTEM have an API?
No public API is recorded for SI SYSTEM.
What industry is SI SYSTEM in?
SI SYSTEM's product category is IT System Development Services. Its primary akta.pro industry code is BPAHAEAB, Enterprise Architecture & IT Operating Model. Its NAICS code is 54151 and its SIC code is 7373.