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About us

An Interactive Community

Soleil Data Dojo is a community where you can learn and practice AI, IoT, and data science.

What We Want to Achieve

We help people unleash their potential in data analysis and become a master

In recent years, beginning with the big data boom, the need for corporate data utilization and digitalization promotion has been talked about widely in various terms, such as AI, IoT, and digital transformation (DX). However, in essence, it means that we are being called upon to "utilize data and digital technology to improve productivity and create new added value."

For that purpose, it is necessary to develop human resources who can handle data and digital technology appropriately and can implement them in society and utilize them for business. However, due to the rapid technological progress in this field and the wide range of knowledge and skills required, it is difficult for individuals and businesses to solve alone.

We provide a place for working people, researchers, and students to share information and learn across organizational boundaries in the fields of AI, IoT, and data science, mainly in the Kansai region.

Who Needs Us?

People Who are Passionate about Data Science

Those Who Want to Learn Data Science

We have online content where you can learn about AI, data science, and IoT.

Students Who Want to Master Data Science

Join our internship programs.

Those Who are Thinking of Changing Careers to the Field of Data Science

eftax Co., Ltd. will consult with you about career changes.

Our Team

Behind the Dojo

Tomoaki Nakai-san

Tomoaki Nakai

Representative director, eftax Co., Ltd.
Manjuo Kobayashi-san

Kobayashi Masuo

eftax Co., Ltd.

Tomoki Kubo

School of Law, Osaka University

Ryosuke Isono

School of Engineering Science, Osaka University

Teruya Inoue

School of Engineering Science, Osaka University

Wataru Imanishi

School of Engineering Science, Osaka University

Hirotsugu Honda

School of Engineering Science, Osaka University

Keishi Uesugi

School of Engineering​, Osaka University

Bryson James.

School of Engineering Science, Osaka University

Atsutomo Yara

School of Engineering Science, Osaka University

Shinjo Hiroki

School of Law, Osaka University

Ryui Yamaji

School of Law, Osaka University

And other masters who are ready to guide you!

Our Vision

Three Principles of Soleil Data Dojo

Add Value

In data analysis and machine learning projects, analysis and modeling itself can become a goal while the original issues or objectives remain unclear. We focus on what we are analyzing and modeling for and what value we will add.

Think, Think, Think

Machine learning and deep learning modeling itself is becoming more automated, and the part that data scientists play is narrowing. On the other hand, There are many things that humans have to think about properly. This includes what kind of problems in the society should be solved, what kind of data should be collected, preprocessing and methods should be applied, and how to incorporate the completed model into the business flow and operate it effectively.

Grow with Team

Social implementation of technologies in the fields of AI, IoT, and data science requires a wide range of knowledge and skills, and it is difficult for one person to cover all of them. Human resources with diverse skills and backgrounds work together to create new value and aim to grow as a team.

Our Program Flow

Soleil Data Dojo Practical Program

Soleil Data Dojo Educational Program

Who We Are

Operating Company

Company Name

eftax Co., Ltd.


3-90-1, Showadori, Amagasaki-shi, Hyogo Amagasaki KR Building 5F


January 8, 2013


Tomoaki Nakai

Business Content

  • Data analysis contract and in-house production support
  • AI / IoT system introduction support
  • Web / mobile application contract development
  • Salesforce /Tableau consulting
  • Data analysis education content provision
  • Data analysis dispatch training for companies
  • Affiliated Companies

    License / Certification

  • Residential Land and Building Transaction Business / Governor of Hyogo (3) No. 204166
  • Paid Employment Agency Business Permit / Permit Number 28-Yu-300936
  • Smart SME Supporter (Certification Number: No. 9-20050017)
  • Join Us!

    Explore Dojo, connect with other masters and master data with us.

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