We believe in the value of Ruby, and it is the foundation of our product development. We provide STORES products—including E-commerce, POS, Mobile Ordering, and Analytics—that drive merchant DX. By integrating these solutions, we offer a comprehensive data platform that enables businesses to make informed decisions and optimize operations. As part of our commitment to the community, we are proud to continue supporting RubyKaigi.

Leaner Technologies is a company that develops and provides a cloud service called “Leaner” designed for procurement division.
Our mission is raising the corporate value of all Japanese companies by digitalizing the corporate shopping process.

SmartBank provides "Onebank", an AI-powered personal financial management service that combines a reloadable Visa prepaid card with a budgeting app. With our Pair Card, couples can share an account, making budget management effortless.

Our finance service is built extensively with Ruby and Rails, handling transactions worth several billion yen every month. We strive to prove that Ruby is capable of building a robust, scalable Fintech system.

pixiv Inc. is a company built around the philosophy of "Accelerate creativity." In addition to pixiv, a platform for illustrations, manga, and novels used by over 100 million users, pixiv Inc. provides many services designed to support creators and fans worldwide, including BOOTH, a creative marketplace for creators; pixivFANBOX, a fan community service; VRoid Studio, a 3D character creation software; and many more!

Studist specializes in lean operations, offering the "Teachme Biz" platform for efficient manual management and productivity enhancement. This tool streamlines information sharing, simplifies work processes, and supports businesses in achieving operational excellence and sustainable growth.

Net Protections is one of the leading Buy Now, Pay Later (BNPL) companies in Japan. Founded in 2000—long before BNPL became mainstream—we have expanded our services into both the enterprise and commercial sectors, both domestically and internationally. Since going public in December 2021, we have grown to serve over 15 million users, generating annual revenue exceeding 130 million USD. Today, our team has grown to more than 300 team members, supporting our operations across multiple regions.

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 Ruby since the very beginning of the product.
While embracing the philosophy of Ruby, we continue to build a product that addresses ever-evolving organizational challenges.

“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.

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.

"mybest" is a service that helps create the best possible selection experience.
We help to match users with goods and services, improving the process of making choices to enrich people's lives.
Furthermore, we aim to expand the range of our services by supporting the various choices that users encounter in their daily lives.

Sentry helps every developer detect, understand, and fix broken code, fast. Using Sentry’s debugging platform–that favors action over dashboards–decreases resolution time from days to minutes, resulting in freed up dev cycles and happier customers. Founded in 2008 by David Cramer and Chris Jennings as an Open Source side project, Sentry is used by over 4 million developers and 150,000 organizations, including Disney, Cloudflare, GitHub, Slack, Instacart, Atlassian, and Riot Games.

Our mission at DELTA is to build an ecosystem that continuously supports engineers in fast-growing companies.
We stand by CTOs and tech leads so they can focus on what truly matters, offering end-to-end support from technology to hiring. As responsibilities grow heavier, peers with the same perspective become fewer, and isolation deepens. Precisely because we work alongside clients, we choose to stay by their side. To keep empowering them, we strive to be strong and economically sound. It is an unprecedented challenge, but we believe that beyond it lies a new form of freedom for engineers.

kickflow, Inc. develops and provides kickflow, a cloud workflow solution for enterprises. kickflow is highly regarded for improving corporate productivity and is utilized by major companies and fast-growing enterprises. We deeply believe in the power of Ruby and are delighted to sponsor RubyKaigi.

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 language, we're excited to be a sponsor of this Kaigi.

Findy Inc. envisions "creating a platform for challenging engineers" and offers scout-based recruiting services such as "Findy" and "Findy Freelance", which visualize high-skill engineer capabilities and connect them with companies. We also provide "Findy Team+ ", a SaaS that visualizes and enhances engineering team productivity. Our solutions are adopted by a wide range of companies, from startups to large enterprises aiming to accelerate their digital transformation. We will continue to create valuable content through technology and innovation, supporting the growth of both companies and engineers.

Linc'well Inc. is a healthcare IT company founded in 2018 with the mission to take healthcare one step further through the use of technology. The company engages in the digitization of primary care, including supporting physical smart clinics as well as providing the online platform for telehealth services. Its flagship platform "CLINIC FOR Telehealth" has become one of the largest telehealth services in Japan, serving patients across 24 categories in both out-of-pocket and insured care categories with a track record of over 7 million consultations.

The matching app "with" was launched in September 2015 and is primarily used by people in their 20s as a platform for serious connections. It is a dating and marriage-oriented matching app that enables users to connect based on shared values. Since its inception, "with" has emphasized "value-based matching," employing approaches inspired by statistics and psychology to help users find their ideal partners. To achieve value-based matching that incorporates deeper psychological aspects, "with" offers unique features such as "psychological tests" to create opportunities for matching with compatible partners and "preference cards" to clearly express individual interests and hobbies.

ZOZO, Inc. owns and operates ZOZOTOWN, Japan’s largest fashion e-commerce. Housed within ZOZOTOWN are category specialized malls such as ZOZOCOSME; ZOZOUSED, a second-hand clothing fashion mall; ZOZOVILLA, a section dedicated to luxury & designer brands; WEAR by ZOZO, a SNS for sharing stylings and outfits, and more - various services for fashion lovers. ZOZO has also developed technology devices for body measurement, such as the ZOZOMETRY, ZOZOMAT, and ZOZOGLASS.

Cookpad provides a global platform for recipe sharing and search, used in 67 countries and regions, in 26 languages. Our mission is to make everyday cooking fun, because we see a brighter future. And we believe that the power of cooking will get us there. Cooking isn’t just a matter of putting together ingredients. When you cook, you choose. You choose what to buy, what to eat, and how to nourish yourself, your family, and friends. You choose how to give back to communities. When you cook, you choose to become a maker of tomorrow’s world. Here at Cookpad, each day is about inspiring more people to make these choices.

Leafea is a startup founded in 2022 that offers a nationwide employee benefits SaaS platform, “Fukuri App.” Built on a partner-driven strategy centered on regional financial institutions, the service expands through locally rooted partners, steadily growing its user base and use cases. Amid rising prices and labor shortages, it is gaining attention as a new form of employee benefits that supports effective wage growth for small and mid-sized businesses without increasing direct payroll costs. Through our service, we aim to redefine how companies support employees and help build a more livable society.

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.

Timee is a matching platform for gig workers launched in 2018. Our mission is "to make the infrastructure which helps everyone to achieve promising future through working." We use Ruby for agile service development to achieve our mission.

TOKIUM develops and provides accounting AI agents, dedicated to "creating time for a future for those who seek a better world."

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.

note is a media platform where creators can freely post and sell various contents such as texts, images, audio and video, and readers can enjoy the contents ,support creators and make purchases.

WED is a Tokyo-based technology company driven by "Making every moment of spending more exciting" and "going beyond the obvious". We create new norms without being bound by conventional answers.
Our flagship app, ONE, offers a unique experience where users provide receipts digitally and receive value in return. In November 2025, we launched Performance Media Network (PMN) to extend this through broader platform integration.
Since 2018, we have collected over one billion receipts, the largest dataset in Japan, using in-house machine learning and data analysis techniques to enable deep consumer insight and support long-term brand value.

JetBrains creates intelligent software development tools used by over 15 million professionals and 88 Fortune Global Top 100 companies. Its lineup of more than 30 products includes award-winning IDEs like IntelliJ IDEA, PyCharm and RubyMine, as well as the JetBrains AI-powered coding assistant, coding agent Junie, and productivity-boosting team tools like YouTrack, Qodana, and TeamCity. JetBrains is also the creator of Kotlin, a cross-platform language used by more than 2.5 million developers annually worldwide. The company is headquartered in Amsterdam, the Netherlands, and has offices around the world. For more information, please visit https://www.jetbrains.com/.

CrowdWorks provides a freelancing website to people who want to work thorough the internet. We have been developing our service with Ruby on Rails since 2011. We continue to challenge providing works which suit one's lifestyle so that accomplishing our mission "Talent infrastructure".

OPTiM utilizes AI, IoT, cloud, and robotics technologies to realize DX in all industries and provide a sustainable future for all people. Our Mobile Device Management service Optimal Biz, developing with Ruby on Rails, currently has administrated introduced 180,000 companies. Optimal Biz is helping IT department introduce corporate DX.

PKSHA, with the mission of "shaping the software of the future," offers a range of AI and AI Agents addressing social issues.These are deployed as tailored for industries such as finance, manufacturing, and education, as well as versatile products including "PKSHA AI Help Desk," and "PKSHA Chat Agent,". The company supports future work styles and aims to foster a society where humans and software evolve together.

stmn, inc. aspires to become a company that unleashes the full potential of "individuals and organizations," fostering a succession of businesses aligned with our management philosophy: to deliver inspiration and spread happiness to a wider community. Our employee engagement platform, "TUNAG," empowers us to achieve this goal.