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We listen carefully to our clients,
think together, and apply uncompromising technical skill.
We build and improve agile IT solutions
that support each client's business growth.
Latest News
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[News] We launched a site introducing Intent System, our approach to Intent-Driven Development (IDD).
We work with AI by communicating intent rather than only detailed specifications.
We support startups that use AI coding agents in production.
Consultations are also welcome. Please take a look! -
[Speaking] AI DevEx Conference 2026
CTO Tomohisa Takaoka will speak on July 23, Room B, 15:00-15:30.
Design becomes the greatest productivity lever in the AI era: data-preserving design changes productivity. -
[Event] AI DevEx Conference 2026
We will participate as a Silver Sponsor at the event held July 22-23, 2026.
CTO Takaoka will also speak. -
[News] How to Bring Niche Technology to Market: J-Tech Japan's Thought Leadership in Practice
Our work was featured in an interview article on Findy.
The article covers our technical communication around Sekiban and how we bring niche technology to the market.
Please give it a read. -
[Slides] Kichijoji.pm39 Online
AI Coding: Expectations and Reality 2026
Slides are available on speakerdeck.com.
Speaker: CTO Takaoka
Our Services
Agile Development for Products and Business Systems
We provide one-stop support from system planning through development and operations.
Our goal is to keep providing systems that are truly valuable to customers at an appropriate cost.
To achieve that, we develop with the following four values in mind.
- Agile Development
We run development cycles in short one- to two-week intervals, demonstrate working software to clients, and use feedback to decide the next improvements and features together.
- Cloud Utilization
In many recent projects, we build and operate systems on cloud platforms such as Microsoft Azure and AWS. Cloud utilization enables rapid development, lower initial costs, and flexible operations that can grow with the client business.
- EngineerOwnership
We keep asking why a system should be built and what value it should create. Each engineer works proactively to solve the client's essential problems, and we invest in internal education so that our engineers can continue learning modern software technologies and development methods.
- AI Utilization
We see AI as a partner that amplifies engineers' knowledge, and we work to understand both its strengths and its limits. By using AI, we aim to deepen our understanding of client domains, solve complex issues, and provide high-quality products.
- Case Studies
Logi Kintai System Co., Ltd. replaced its attendance system for the transportation industry, "Kintai Driver", with Microsoft Azure. The project was introduced as a Microsoft customer story in November 2022.
The first consultation is free. Please feel free to contact us.
Consulting and Training for Software Architecture
We provide the following services based on practical knowledge of software architecture gained through real projects.
Our consultants and instructors are experienced active engineers who speak at events for engineers in Japan and overseas, write technical books, and actively share knowledge through technical blogs.
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Consulting on advanced design methods such as Domain-Driven Design (DDD), CQRS, and Event Sourcing, as well as AI-assisted development methods
- Introducing advanced methods all at once can stall development. We provide practical proposals that allow teams to adopt them while confirming their effects.
- We provide knowledge for using AI not merely as a code generation tool, but as a safe and effective way to maximize engineers' creativity and productivity.
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Hands-on seminars using Sekiban, an Event Sourcing framework
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We help solve common challenges in adopting Event Sourcing, including lack of specialized knowledge and difficulty applying it in practice.
- Personal support from experienced engineers is available.
- A structured consulting flow with hands-on exercises supports practical system development.
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We help solve common challenges in adopting Event Sourcing, including lack of specialized knowledge and difficulty applying it in practice.
- Case Studies
You can read a PR TIMES case study about our paid hands-on consulting using Sekiban in a real project setting.
For specific programs, we first listen to your situation and propose the approach we believe will be most cost-effective.
Please feel free to contact us.
DX Promotion and Operations Support
We provide hands-on engineering services that work alongside clients as one team to promote DX and support stable operations for companies and local governments.
We provide engineering implementation and support services for a wide range of industries, including local government, pharmaceuticals, and RFID solutions.
If you need more information or support, please feel free to contact us.
Sekiban is an Event Sourcing and CQRS framework for .NET.
It stores not only the current state, but every change as immutable events. This increases the value of data and improves reliability and efficiency.
Events can be stored in Azure Cosmos DB or AWS DynamoDB.
It was released as open-source software in December 2023.
You can find information about Sekiban on the service site.
Documentation, quick starts, and other content are available to support smooth development.
Please check it out!
We share information about Event Sourcing and Sekiban through seminars and podcasts.
Videos and slides from our talks are available in the news archive.
If you need more information about Sekiban, please feel free to contact us.
Technology Stack
We use the technologies best suited to our clients' businesses.
Our technology stack is listed on What We Use.
About Us
With offices in Tokyo and New York, we work every day as one team, bringing together engineers and designers around the world.
You can see how we collaborate and how our engineers share technical knowledge on our blog page.
J-Tech Japan, Inc.
| Address | Shinagawa NSS Building 4F, 2-13-31 Konan, Minato-ku, Tokyo 108-0075, Japan |
| Phone | 03-5461-2175 |
| President and CEO | Masaki Yamaguchi |
| External CTO | Tomohisa Takaoka |
| Employees | 31 employees (as of March 2026) |
| Business | System development, maintenance, and operations |
| Capital | 10 million yen |
| Bank | MUFG Bank |
| Shareholder | Japan Technical Software Co., Ltd. |
| Established | April 1, 2008 |
JTS Group
We are a group company of Japan Technical Software Co., Ltd. (JTS), a comprehensive IT company that celebrated its 50th anniversary in 2020.
Japan Technical Software Co., Ltd.
Please feel free to contact us about your project.