Sponsors

ESM is one of Japan's premier companies building Ruby/Rails applications in an agile way. We believe in Ruby and Agile because we believe in people. We build applications which work well and make customers happy.

kickflow, Inc. develops and provides "kickflow," a cloud-based workflow platform for enterprises. With the mission of "Unlocking the future of enterprise companies by facing issues," we have reimagined workflow systems from the ground up — addressing long-standing challenges such as operational complexity, the burden of organizational restructuring, and weak integration with external systems. We are committed to delivering a workflow solution that is simple yet powerful. Our backend is built with Ruby on Rails, and we are looking for Rubyists who want to tackle these challenges alongside us.

Coincheck, Inc. operates “Coincheck,” a cryptocurrency trading service that has been ranked “No. 1 in Japan*” for app downloads for seven consecutive years. With the mission of “Bringing the exchange of new value closer to everyone,” the company aims to create better services based on the latest technology and advanced security, enabling users to experience firsthand the “exchange of new value” generated by cryptocurrencies such as Bitcoin and Ethereum, as well as blockchain technology.
* Scope: Domestic cryptocurrency trading apps; Data provided by AppTweak

SmartBank develops "Onebank", an AI money management app that makes personal finance effortless. With a Visa prepaid card, smart budgeting, and our Pair Card for couples sharing an account, Onebank helps anyone see where their money goes—and where it should go next.
We're building this AI-era Fintech on Ruby and Rails, processing several billion yen in monthly transactions. Our mission is to combine generative AI with human-centered design so that anyone can take control of their money with confidence, and to keep proving that Ruby remains a powerful, modern foundation for secure financial infrastructure at scale.

TimeTree, Inc. develops and operates the calendar sharing application "TimeTree" with a mission, "Connecting your time with time-related information about people, events, services and various media content around you, so that you can make better choices for a better tomorrow".

MyVision is an HR solutions company solving the challenges of Japan's career-change market through technology, robust systems, and top-tier talent. We value both our agents—who support job-seekers and companies—and highly specialized professionals such as engineers and marketers. By bringing diverse talent together to collaborate, we aim to become an industry-leading company. For us, technology isn't merely a tool for management; it's the core of our business. Our engineering team owns that technology and takes direct responsibility for transforming both our company and the industry. We're excited to connect with the engineering community at Kaigi on Rails 2026.

“giftee” is a service that enables one to send an eGift via email or LINE, etc, along with the wishes of thank you, congratulation, good job, in a casual manner. A wide range of casual gifts are available for your selection, redeemable at the respective stores nationwide.

Kurashiru Inc. operates several major services, including "Kurashiru," one of Japan's largest recipe video platforms, the savings app "Receipt Challenge," the lifestyle media "TRILL," and "LIVEwith," one of Japan's largest liver management agencies. Guided by the vision "BE THE SUN," the company strives to be a presence that creates a bright and far-reaching impact on the world.

Link and Motivation is a company that supports organizational transformation by focusing on the relationships between organizations and individuals, with motivation as its core concept.
We provide Motivation Cloud, Japan’s leading organizational improvement platform, which is used by a wide range of companies and organizations both in Japan and abroad.

Motivation Cloud has been developed consistently in Rails since the very beginning of the product.
While embracing the philosophy of Rails, we continue to build a product that addresses ever-evolving organizational challenges.

We provide the real-time real estate agent site "ITANDI BB" and SaaS systems suite for real estate companies. "ITANDI BB" serves as a platform connecting real estate agents, enabling quick property searches, reservations for property viewings, and submission of move-in applications. With seamless real-time integration of property information from management companies, the data remains live and consistently updated around the clock, every day of the year. From booking and managing viewing appointments to handling move-ins, contract signings, renewals, move-outs, and customer management, our system provides end-to-end support for every stage of the rental process.

GMO Flatt Security is a Japanese cybersecurity firm focused on developer security and software supply chain integrity.

Our offering combines world-class penetration testing across Web, Mobile, Cloud, LLM, and IoT with Takumi, our AI security agent. Takumi performs hybrid SAST/DAST analysis with safe exploit simulations for near-zero false positives, and protects the supply chain by blocking malicious packages and securing CI/CD workflows.

GA technologies’ mission is to create surprise and inspiration through technology and innovation, and move the world forward. Since our founding, we have led transformation in the proptech industry as a pioneering leader.

In a traditionally analog real estate market, we leverage data and technology to deliver diverse services, including RENOSY, a transparent and fair AI-driven real estate investment platform that brings greater trust to the industry.

Together with ambitious teammates, we are building services that enable anyone, anywhere to engage in real estate transactions and asset building with confidence and ease.

Hubble is a contract management cloud service designed to elevate contract knowledge for everyone involved in business. By enabling seamless collaboration between legal and business teams, Hubble addresses the challenges of contract-related tasks, which often involve multiple departments. Our mission is to become the essential infrastructure for contract operations in every organization. With a focus on world-class user experience, Hubble empowers teams to work efficiently and proactively in managing agreements, driving productivity and collaboration across the company.

SMS is a global company whose mission is to create values and contribute to society by providing an "information infrastructure for an aging society." We have developed over 40 services based on information technology which are targeting those who are associated with aging society in Japan and Asia Oceania since our founding in 2003.

Gaji-Labo Inc. specializes in empowering product development teams within startups and established enterprises. Our experts in UI design, front-end development, and product management work alongside your team to drive sustainable growth and ensure the success of your products.

During phases of rapid scaling or organizational chaos, simply increasing headcount is rarely enough. Our skilled professionals are here to optimize your teamwork and deliver meaningful, lasting improvements. Let's collaborate to strengthen your team and propel your product forward.

Unifa Inc. aims to resolve various social issues surrounding childcare and child-rearing through digital transformation (DX). Guided by its corporate purpose, "Creating a new social infrastructure worldwide that generates family happiness," the company develops and operates "Lookmee," a comprehensive ICT and training service tailored for nurseries, kindergartens, and preschools.

By leveraging cutting-edge technologies such as AI and IoT, Unifa strives to significantly reduce the daily administrative workload of childcare professionals. This initiative creates valuable time and mental space for educators, ultimately allowing them to foster richer, more meaningful interactions with children.

Redefining the conventions of health tech――
Founded by a physician more than twenty years ago, MedPeer holds fast to its enduring mission—"Supporting Doctors, Helping Patients."—while calling the present its "second founding," in the midst of an AI-first transformation. Meeting medicine's vast and complex challenges takes robust code and the power of AI.
At MedPeer, we draw on Ruby on Rails and years of accumulated engineering know-how to embrace what comes next and reshape the future of healthcare through technology. Won't you join us on this bold voyage?

ANDPAD is Japan's leading construction management SaaS, trusted by 260,000+ companies and 690,000+ professionals. As a mission-critical platform, we leverage Ruby on Rails and modern engineering to tackle complex domain challenges and modernize a massive legacy industry. We build scalable, high-impact solutions that drive societal change and transform on-site workflows.

We are proud to support the Rails community and can't wait to connect with fellow developers at Kaigi on Rails 2026!

SonicGarden builds software as a long-term partner, not a one-time vendor.

Our programmers own the full cycle — from strategy to code to operations.
No handoffs. No delivery dates. Just ongoing responsibility.

We build with Ruby on Rails and believe programming can be a lifelong craft.

We're hiring engineers who want to take real ownership of their work.

i Cubed Systems, Inc. provides software service "CLOMO" an enterprise mobile device management solution. Empowering efficient use of mobile devices, CLOMO drives digital transformation for businesses.

SmartHR is the number one rated HR cloud based software optimized for labor management. Our software not only focuses on employee management and administration, but also growth and productivity. Customers can accelerate digital transformation of HR manual processes including year-end-tax adjustments, employment contracts, new employee registrations, issuing payslips, employee data management, and more. Furthermore, providing talent management functionalities contributes to improve employee productivity and engagement. For this reason, SmartHR is among the leading progressive cloud-based HR solutions enhancing the growth of companies in Japan.

As a big fan of the Ruby on Rails, we're excited to be a sponsor of this Kaigi.

B4A provides an innovative, all-in-one SaaS platform tailored specifically for non-insured medical clinics. Our product integrates essential features, such as online reservations, EMR, payment processing, and business intelligence analytics, into a one-stop solution for modern clinic operations and management.

Driven by an urgent need for operational efficiency in the expanding non-insured medical sector, our platform addresses this challenge directly, fueling our rapid growth.

To lead this market as a platformer, we use Ruby on Rails to build scalable systems and maintain a high velocity of development. Moving forward, we will continue to enhance our engineering standards to support medical providers.

Money Forward is a leading Japanese Fintech company providing B2B SaaS such as online bookkeeping, HR management, contract management, and payroll, plus PFM services.

Repro is a marketing solutions company that combines the power of technology with the power of people to solve challenges between users and services.

We provide a customer engagement platform to boost user engagement on websites and apps, along with site speed improvement tools.