What SSN does

サンネット株式会社 (SunStarNetwork Co., LTD; abbreviated SSN) is a privately held Japanese IT services company headquartered in Kawasaki, Kanagawa Prefecture. Founded on January 24, 2000 as a spin-off of the network division of predecessor SunStarSystem Co., Ltd. (with subsequent group consolidation completed in December 2008), SSN provides software development and infrastructure services to enterprise customers across web services, cloud services, manufacturing, and local government. The company is founder-controlled, with Geng Jianling (耿 建瓴) serving as Representative Director and Personal Information Protection Manager.

SSN's portfolio combines a suite of in-house platform products with professional services. The core product line consists of three documented systems: a Data Display System that aggregates measurement data and renders electricity/consumption visualizations; a Remote Monitoring System providing 24/7 collection, real-time monitoring, alarm notification, and CSV reporting; and a Big Data Foundation System built on HBase that ingests sensor, system, and web data and applies real-time machine learning, classification, anomaly detection, prediction, and recommendation, with batch aggregation and API-based external publication. Complementary service offerings cover application and smartphone-app development, system operations management, database design and optimization, security design, IoT platform construction, AI/ML implementation support, cloud migration, DevOps/CI-CD, and high-availability/virtualized server platforms. Technology stack disclosure centers on Java, Python, and other mainstream languages.

Revenue is generated through project-based B2B professional services engagements sold via direct enterprise sales from the Kawasaki headquarters, with delivery extending into the Tokyo metropolitan area. Pricing is not publicly disclosed and is described as negotiable by experience and capability. The firm holds a JIPDEC Privacy Mark certification continuously since October 2015 (sixth renewal in progress as of October 2025) and received Kanagawa Prefecture Business Innovation Plan approval in June 2025. Named clients include NTT Advanced Technology, NTT TechnoCross, NTT Solutions, PayPay, and GungHo Online Entertainment. Registered capital is ¥20,000,000; headcount falls in the 11-50 employee range, with no external institutional investment disclosed.

Name

SSN

Legal name

サンネット株式会社

Website

https://sun-star.co.jp

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

11–50 employees

Short description

サンネット株式会社 (SSN) is a privately held, Kawasaki-based Japanese IT services firm providing application development, IoT, AI/ML, cloud migration, and big data platform solutions to enterprise clients across telecommunications, fintech, gaming, manufacturing, and local government.

Ownership category

akta.pro rank

Headquarters

HQ city

Kawasaki

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

Revenue model

1. Software Development Services: Professional services revenue from application design and development, smartphone app development, system operations management, database design and optimization, security design, and web/AP/DB server installation. Also includes IoT solutions, AI/machine learning implementation support, and cloud migration services.

Go-to-market motion1 record

Distribution channels1 record

Core offering

SSN (SunStarNetwork) provides custom software development, IoT platform construction, AI/machine learning implementation support, cloud migration, and server platform building services to enterprise clients. The company also develops proprietary systems for data visualization, remote monitoring, and big data analytics. It serves web service companies, cloud providers, manufacturers, and local government agencies primarily in the Kanto region of Japan.

Product overview

SSN offers a portfolio of software solutions and IT services. The core product portfolio includes three integrated systems: the Data Display System for visualizing collected measurement data, the Remote Monitoring System for real-time 24/7 monitoring and data collection across multiple locations, and the Big Data Foundation System for large-scale data collection, real-time analysis, and external data publication. Complementing these are service offerings in application infrastructure development, IoT solutions, AI/machine learning implementation support, cloud implementation, and server platform construction. The company provides one-stop services combining application development with infrastructure construction.

Differentiator

Problem solved

Functional benefit

Products and services

• Application Infrastructure Development (アプリケーション基盤開発) End-to-end application design and development, smartphone app development, system operations management, database design and optimization, security design, and Web/AP/DB server installation for enterprise clients.
• IoT Solutions (IoTソリューション) IoT platform design and development, sensor data collection and analysis, and full IoT platform construction services for manufacturing and enterprise clients.
• AI/Machine Learning Implementation Support (AI・機械学習導入支援) Model development support, data preprocessing and analysis support, and deep learning implementation services for enterprise AI initiatives.
• Cloud Implementation Support (クラウド導入支援)

Named customers5 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature3 records

Partnerships

Five partnerships are on record, tiered minor.

• NTT Advanced Technology Corporation (NTTアドバンステクノロジ株式会社)minorOthersListed as a trading partner/client. Company provides IT development services to NTT Advanced Technology.
• NTT TechnoCross Corporation (NTTテクノクロス株式会社)minorOthersListed as a trading partner/client. Company provides IT development services to NTT TechnoCross.
• NTT Solutions (株式会社エヌティ・ソリューションズ)minorOthersListed as a trading partner/client. Company provides IT development services to NTT Solutions.
• PayPay Corporation (PayPay株式会社)minorOthersListed as a trading partner/client. Company provides IT development services to PayPay.
• GungHo Online Entertainment (ガンホー・オンライン・エンターテイメント株式会社)minorOthersListed as a trading partner/client. Company provides IT development services to GungHo Online Entertainment.

Scale indicators3 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Fuji Soft Incorporated: Japanese system integrator providing embedded software, application development, and IT services across manufacturing, finance, and public sectors. Comparable in offering custom application and infrastructure services and serving enterprise Japanese clients.
• BIPROGY (formerly Nihon Unisys): Established Japanese system integrator providing software development, cloud/DX services, and IT outsourcing to enterprise customers. Closely comparable in business model — long-tenured Japanese SI serving enterprise clients with application and infrastructure integration.
• Otsuka Corporation: Japanese IT services and system integration firm providing application development, infrastructure, and managed services primarily to mid-market and enterprise customers. Comparable professional services delivery model and B2B enterprise focus to SSN.
• Internet Initiative Japan (IIJ): Japanese internet/network services and systems integration provider offering cloud, security, IoT, and enterprise IT services. Comparable to SSN in cloud infrastructure, IoT, and security-adjacent service offerings to Japanese enterprise customers.
• BayCurrent Inc. Japanese consulting and digital solutions firm providing IT strategy, digital transformation, and custom software implementation. Directly comparable in DX-oriented application development and enterprise consulting services targeting Japanese corporates.
• Future Corporation: Japanese IT consulting and systems integration firm focused on end-to-end enterprise application development and infrastructure services. Directly comparable scale and service breadth to SSN with similar end-to-end application+infrastructure positioning.
• TIS Inc. Mid-to-large Japanese IT services company offering custom application development, cloud and DX consulting, and SI services to financial, manufacturing, and public-sector clients. Highly comparable in service mix (app dev, cloud migration, IoT/AI) and customer segmentation to SSN.
• NS Solutions Corporation: Japanese system integrator spun off from Nippon Steel providing application development, cloud, IoT, and AI/data analytics services to manufacturing and enterprise clients. Direct overlap with SSN's manufacturing and IoT customer segments and DX service portfolio.

Broad incumbents

• NTT Data Group: Japan's largest IT services and system integrator, providing application development, cloud, and infrastructure services to enterprise and public-sector clients. While far larger and more diversified, NTT Data occupies the exact same professional services / systems integration category as SSN and shares relationships with NTT-affiliated entities.
• Nomura Research Institute (NRI): Large Japanese IT consulting and systems integration firm with strong financial-sector focus, offering consulting, application development, and managed IT services. Significantly larger than SSN but operates in the same custom development and SI category serving enterprise Japanese clients.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance1 record

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 SSN