Greeting from the Representative: Fumihiro Matsui

Hello, my name is Fumihiro Matsui (松井文宏), the representative of RINEARN.

Welcome - About RINEARN

Thank you for visiting the RINEARN website. RINEARN is a software development studio I operate independently as a sole proprietorship. Allow me to provide a brief introduction, including some background about myself and the journey of RINEARN so far.

About RINEARN, its software, and its activities

Perhaps - more likely than not - you have come across this site after using one of the freeware tools developed and published by RINEARN. In fact, this website originally started as a "repository" for distributing such creations during my student years, more than 15 years ago.

At that time, I was majoring in physics at university, frequently engaging in numerical calculations and data analysis. As a programming enthusiast, I genuinely enjoyed these tasks. Over time, I began creating my own analysis software, and since I had gone through the trouble of developing them, I decided to share them publicly.

To make the website more lively, I also started uploading simple programs and sample code for calculations and visualizations, almost like writing blog posts.

Initially, this site was just a personal homepage for showcasing my hobby creations. However, some of these creations seemed to fulfill niche demands. Unexpectedly, they found use in various contexts, and I received feedback from users. These interactions led to surprising connections and exchanges, which turned out to be quite enjoyable. Before I knew it, I had been maintaining the site for over a decade.

Transitioning into a Sole Proprietorship Studio - Present Day

By then, I was no longer a student and had started writing programs professionally. At one point, I decided to establish a sole proprietorship studio. Over the years, this site and my creative activities had grown to hold a special significance for me, so I formally adopted the site name 'RINEARN' as the business name. This marked the official beginning of RINEARN as a software development studio in 2018.

Even after transitioning to a business, I continue to develop and release the analytical freeware tools and various programs that RINEARN originally focused on, treating them as part of my contribution efforts. I hope to keep these activities going as much as possible. This is because I, too, have relied on many free analysis/calculation software tools, libraries, and sample code from my student days to the present. Continuing these efforts is my way of giving back, albeit in a small way, and I hope they can be of use to others.

About Our Services (Business Activities)

As mentioned earlier, RINEARN currently operates as a development studio and freelance engineer, accepting work requests primarily in Japan. While the primary focus is on development and analytical tasks, as shown in the examples below, I can generally handle a wide range of requests within the scope of my capabilities.

Business Activities

Here are examples of the types of work I undertake.

Software Development

I accept requests for the development of new software, or for subcontracted tasks involving partial development of other developers' software projects.

Various Work Assistance and Support

I provide support or take on delegated tasks to assist with other company's operational activities. (Think of it as a "helping hand" service.)

Customization and Support for Existing Software

As part of the above services, I also handle modifications or extensions to existing code upon request, if possible. Additionally, I provide support for introducing software into specialized use cases, as well as related development tasks.

Qualifications and Skills

Ph.D. in Science (Physics)

In the past, I conducted simulations of quantum systems in the field of physics (Quantum Chaos), involving complex matrix operations, eigenvalue/eigenvector analysis, and statistical analysis.

Applied Information Technology Engineer Certification (National Exam in Japan)

Certified in 2018, with elective subjects including "Information Security, Programming, System Architecture, Embedded System Development, and Information System Development."

Supported Programming Languages (in order of usage frequency)

Java, C/C++, Python, JavaScript/TypeScript, C#, VB.NET, PHP, Fortran, and others (Recently, I have also been exploring Rust.)

Examples of Services Provided

Design and implementation of application software, extensions and modifications of existing software, rendering/visualization/GUI-related work, various data analyses including matrix analysis and Fourier analysis, and other tasks as required.

Contact Information

Feel free to reach out!

Email and Web Form

You can find a web contact form on the page linked above, as well as an email address. Please don't hesitate to get in touch if you have any questions or concerns.

We also accept inquiries on X (Twitter)

Our official X (Twitter) account also accepts questions. Feel free to ask about anything, such as tips or clarifications regarding the use of our software.