GSA Japan

What GSA Japan does

GSA Japan (株式会社ジーエス・アーキテクト) is a privately held Tokyo-based IT services firm founded in November 2002, providing end-to-end system consulting, design, development, operations, and maintenance alongside SES (System Engineering Service) staff augmentation. The firm operates from its headquarters in Ikebukuro, Toshima-ku, and is led by Representative Director Sabae Gentaro (鯖江源太郎). With 15 employees including contract staff and ¥10 million in registered capital, GSA is a small, founder-managed, bootstrapped services company with no disclosed external investment, parent company, or M&A history.

Technically, GSA delivers across the full enterprise IT stack, covering open/Web systems, host/mainframe environments, and infrastructure/network architectures using .NET, C, Java, and COBOL. Its service portfolio is organized into four pillars: system consulting (requirements analysis and solution proposals); system design, development, operations and maintenance; infrastructure and network construction and maintenance; and SES staff augmentation delivered in partnership with other firms. The company positions itself as a "select few" (少数精鋭) team that prioritizes engineer character alongside technical skill, with the CEO personally conducting all hiring interviews and project placements aligned to engineer career goals.

Commercially, GSA operates a direct enterprise field-sales model, deploying engineers to client projects in the Tokyo 23 wards and surrounding prefectures. Revenue is generated through professional services fees for full-lifecycle engagements and SES billings, with no publicly disclosed pricing, named customers, or revenue figures. The company holds a Specified Worker Dispatch Business Permit (特13-310450) obtained in December 2008, and serves enterprise clients across financial, manufacturing, and HR/payroll business domains. Its primary outward-facing assets are a minimal company website (gsarc.co.jp) and an open call for complementary business partners.

Name

GSA Japan

Legal name

株式会社ジーエス・アーキテクト

Website

https://gsarc.co.jp

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

11–50 employees

Short description

GSA Japan is a small, Tokyo-based IT services firm providing system consulting, design, development, operations, maintenance, and SES staff augmentation across open/Web, host, and infrastructure platforms for enterprise clients in financial, manufacturing, and HR/payroll sectors.

Ownership category

akta.pro rank

Product category

IT Services

NAICS

Computer Systems Design and Related Services (54151), Professional, Scientific, and Technical Services (54)

SIC

Services-Computer Programming, Data Processing, Etc. (7370), Services-Computer Integrated Systems Design (7373)

akta.pro primary industry

Systems Engineering & Technical Program Management (BPAHAIAI)

Keywords

• IT consulting services
• System development
• SES engineering dispatch
• Infrastructure network services
• System maintenance support

Headquarters

HQ city

Toshima

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations

Revenue model

1. SES (System Engineering Service): GSA Japan provides System Engineering Services by deploying engineers to client sites. Customer requirements for cost, location, technical skill level, and know-how are matched with partner companies to deliver optimal solutions. Revenue is generated through engineering service fees charged to clients.
2. System Consulting, Design, Development, Operations and Maintenance: Full lifecycle IT services from consulting and system design through development, testing, and ongoing operations and maintenance. Services are delivered across financial, manufacturing, HR/payroll business domains and across open/Web, host, and infrastructure platforms.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

GSA Japan (株式会社ジーエス・アーキテクト) provides IT consulting, system design/development, operation and maintenance, and infrastructure/network construction services, primarily serving financial, manufacturing, and HR/payroll business domains. The company also dispatches engineers through its SES (System Engineering Service) offering, supporting projects across open/web, host (mainframe), and infrastructure platforms using technologies such as .NET, C, Java, and COBOL.

Product overview

GSA Japan (株式会社ジーエス・アーキテクト) is an IT services company offering a unified portfolio of system development and support services. The portfolio consists of four interconnected service offerings: System Consulting (システムコンサルティング) for requirements analysis and proposal; System Design, Development, Operation, and Maintenance (システム設計・開発・運用・保守) covering software development across multiple platforms including .NET, C, JAVA, and COBOL for domains such as finance, manufacturing, and HR/payroll; Infrastructure and Network Services (基盤系システム・ネットワーク構築・運用・保守) for infrastructure and network construction and maintenance; and System Engineering Services (SES) for staff augmentation solutions. These services are provided across open, web-based, host, and infrastructure technology stacks without restricting by programming language or computer architecture.

Differentiator

Problem solved

Functional benefit

Products and services

• System Consulting
• System Design, Development, Operation and Maintenance
• Infrastructure Systems & Network Construction
• SES (System Engineering Service)

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• Business Partners (unspecified)minorOthersGSA Japan is actively seeking business partners ('ビジネスパートナー') who can leverage mutual strengths, efficiently exert combined capabilities, and share mutual benefits. The company describes its ideal partner as one where both parties can contribute their strengths, perform efficiently, and share advantages, though no specific partner companies are named.

Scale indicators3 records

Recent moves5 records

Expansion highlights4 records

Broad incumbents

• SCSK Corporation: Large Japanese systems integrator providing end-to-end IT services from consulting through maintenance across multiple industries. Operates in the same full-lifecycle IT services category as GSA, with much broader scale and industry coverage.
• Otsuka Corporation: Japanese IT services and solutions provider covering system development, infrastructure, and maintenance. Overlaps with GSA's multi-platform approach (open, web, host) and serves similar enterprise customers across industries.
• BIPROGY Inc. Established Japanese IT services firm (formerly Nihon Unisys) with deep presence in financial, manufacturing, and HR systems — overlapping with GSA's stated target verticals and providing full-stack development and operations services.
• Internet Initiative Japan (IIJ): Japanese IT services and network infrastructure provider with strong capabilities in systems integration, network construction, and ongoing operations — overlapping with GSA's infrastructure/network and maintenance services lines.
• TIS Inc. Major Japanese IT services company offering consulting, system development, and operations/maintenance across financial, manufacturing, and HR/payroll domains — a direct overlap with GSA's service portfolio and target industries, but at vastly greater scale.

Direct peers

• VSN Inc. Japanese engineering services firm specializing in SES/staff augmentation across software, infrastructure, and mechanical/electrical engineering — the closest direct competitor in business model (engineer dispatch) and multi-domain capability.
• Akros Inc. Tokyo-based Japanese IT services firm focused on SES and contracted engineering talent for enterprise software and infrastructure projects — directly comparable in size, model, and target customer segment to GSA.
• Insight Inc. Japanese IT services company providing contracted engineer (SES) and consulting services across IT infrastructure and application development — closely matches GSA's SES-driven, multi-platform service model.

Regional players

• Nihon Unisys Solutions: Japanese systems integrator focused on financial and enterprise IT services with deep mainframe/host expertise — competes with GSA in the same legacy-system modernization and maintenance niche within the domestic Japanese market.

Emerging players

• Business Engineering Corporation: Japanese IT services and consulting firm with strong domain expertise in HR/payroll systems — overlaps with one of GSA's three stated target verticals and competes for similar enterprise system development work.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks6 records

Key highlights5 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about GSA Japan