TSS Software Company

What TSS Software Company does

TSS Software Company (株式会社トラストシステム・サービス / TrustSystemService Co., Ltd.) is a privately held Japanese IT services company founded on March 5, 1988, headquartered in Taito-ku, Tokyo. The firm operates as a B2B outsourcing provider of enterprise system development, custom application software development, and website/web application development, targeting enterprise customers that require internal business systemization, inter-company or group company system integration, and dedicated system management. Its technology stack is broad and legacy-inclusive, spanning Java, PHP, C#, JavaScript, ASP.Net, VB.Net, C, C++, COBOL, and FORTRAN across Windows, Linux, and AIX platforms, with database experience across Oracle, SQL Server, DB2, MySQL, PostgreSQL, and AWS cloud infrastructure exposure. Service delivery follows a full-lifecycle model — specification planning, system design (requirements, basic, detailed, external), development, programming, testing, and ongoing operation and maintenance — which makes it competitive for both greenfield build and ongoing maintenance of long-tenured enterprise estates.

The company generates revenue exclusively through business outsourcing contracts (業務委託) negotiated directly with enterprise clients on a custom, project-based pricing model with multi-year contract cadences. Distribution is purely direct enterprise sales with no intermediaries or resellers; inquiries are handled via email ([email protected]) and phone. Major disclosed clients include Fujitsu Japan (富士通Japan株式会社), Canon IT Solutions (キヤノンITソリューションズ株式会社), Neo System (株式会社ネオシステム), LTI (株式会社エルティ), and First System (ファーストシステム株式会社) — all enterprise buyers, several of which are themselves major Japanese IT services or systems integrators. The company holds 11-50 employees and ¥10 million in registered capital.

TSS has held ISMS certification (JIS Q 27001) continuously since October 2006, with the latest version being JIS Q 27001:2025 (ISO/IEC 27001:2022+Amd 1:2024), and treats information security as a primary differentiator in customer engagements. Ownership, investor, and detailed shareholder information are not publicly disclosed; representative director and President is Tanaka Naoyuki (田中 直行), who formally signed the company's information security policy in January 2024 and relocated headquarters in April 2025. Banking relationships are with MUFG Bank Asakusabashi branch (primary) and Shoko Chukin Bank Asakusabashi branch (secondary). The company has no disclosed foreign operations, no active social media presence, and no public marketing beyond its website.

Name

TSS Software Company

Legal name

株式会社トラストシステム・サービス

Website

https://trustsys.co.jp

Company type

Private

Founded year

1988

Operating status

Operating

Headcount range

11–50 employees

Short description

TSS Software Company is a privately held Tokyo-based Japanese IT services firm founded in 1988 that provides B2B outsourcing for enterprise system development, custom application software, and web development to enterprise clients in Japan.

Ownership category

akta.pro rank

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure

Revenue model

1. System Development Outsourcing Contracts: The company provides B2B system development contract services (業務委託) to enterprise clients. Services include enterprise system planning, development, and maintenance. Revenue is generated through project-based contracts with customers requiring system development and operational support.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

TSS Software Company provides B2B outsourced enterprise system development, custom application software development, and website development services to corporate clients in Japan. The company handles the full software lifecycle from specification planning, requirements definition, and system design through programming, testing, system operation, and ongoing maintenance, supporting multi-platform environments (Windows, Linux, AIX) and multiple programming languages including Java, PHP, C#, JavaScript, COBOL, and FORTRAN.

Product overview

TSS Software Company (株式会社トラストシステム・サービス) operates as a single-service IT services firm offering enterprise system development as its primary offering. The portfolio consists of three integrated service lines: 企業システム開発 (Enterprise System Development), which handles B2B system planning, development, and maintenance; アプリケーションソフト開発 (Application Software Development), covering PC/mobile/tablet application development from design to release; and Ｗebサイト開発 (Website Development), providing web infrastructure and site development for global information sharing. All three services are delivered under a unified service model and share common technical capabilities (Java, PHP, C#, VB.Net, COBOL, and related frameworks) and business process stages (specification planning, system design, development, programming, operation, and maintenance).

Differentiator

Problem solved

Functional benefit

Products and services

• Enterprise System Development (企業システム開発)

Named customers5 records

Segments1 record

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Two partnerships are on record, tiered minor.

• 三菱UFJ銀行 浅草橋支店minorOthersPrimary banking partner for business transactions
• 城北信用金庫 浅草橋支店minorOthersSecondary banking partner for business transactions

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• TIS Inc. Japanese IT services and system development firm offering custom enterprise system development and outsourcing across financial, industrial, and public sectors. Highly comparable business model and target customer base to TSS, though at significantly larger scale.
• JBCC Holdings: Japanese IT services company offering enterprise system development, cloud integration, and managed services with a strong security/compliance orientation. Direct overlap with TSS in ISMS-anchored enterprise development.
• NCS&A Co., Ltd. Mid-sized Japanese system integrator focused on custom enterprise software development and maintenance, with strengths in legacy modernization (including COBOL) — closely aligned with TSS's technology stack and service profile.
• Future Corporation: Tokyo-headquartered IT services and consulting firm providing custom enterprise system development, IT strategy consulting, and managed services to Japanese enterprises — comparable mid-market SI profile to TSS.
• DSK Co., Ltd. Japanese IT services firm delivering custom enterprise application development and maintenance, with multi-language stack coverage similar to TSS and a comparable focus on Japanese domestic enterprise customers.

Broad incumbents

• BIPROGY (formerly Nihon Unisys): Major Japanese SI offering enterprise system development, outsourcing, and ISMS-aligned services across banking, retail, and government. Overlaps with TSS in core custom development but operates at vastly larger scale with packaged product offerings.
• NTT Data Group: Global-scale Japanese system integrator providing enterprise system development, maintenance, and outsourcing across virtually every industry vertical. Significant overlap with TSS's service portfolio at the high end of the market.
• ITOCHU Techno-Solutions (CTC): Major Japanese SI offering enterprise system development, cloud services, and IT outsourcing with strong ISMS/security credentials. Competes with TSS for enterprise development contracts but at materially larger scale.
• NRI (Nomura Research Institute): One of Japan's largest consulting-led SIs, providing custom enterprise system development and IT outsourcing to financial and industrial clients. Comparable in offering but vastly larger and more diversified than TSS.

Regional players

• Internet Initiative Japan (IIJ): Japanese IT services and network provider that, alongside its network/cloud core, offers enterprise system development and integration services to Japanese enterprise customers — partial overlap with TSS's portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights6 records

Customer concentration

Compliance3 records

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 TSS Software Company