Sponsors

SmartBank provides B/43, a Visa prepaid card designed for finance management. With our B/43 Pair Card, couples can share an account, making budget management effortless.

Our finance service extensively uses Ruby and Rails as its foundation, supporting transactions over several billion yen every month. We strive to prove Ruby is capable of building such a scalable and robust Fintech system.

ANDPAD is Japan's largest cloud-based construction management platform that enables centralized management, from enhancing on-site efficiency to driving overall business improvement. With its intuitive and user-friendly UI, ANDPAD is relied upon by over 202,000 companies. Our platform serves more than 510,000 professionals in the construction and building industry. We are dedicated to using technology to achieve digital transformation in the construction industry, driving societal change along the way.

We provide "STORES" products, enabling merchant DX with various solutions; E-commerce, Point-of-Sales, Payments, Bookings, and CRM app. 3 products are built with Ruby. We contribute to the growth of Ruby by supporting RubyKaigi which makes huge positive influence on the Ruby Programming and the Ruby Community.

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.

Supporting creators around the world, pixiv Inc. provides various services which are visited by more than 80 million creators and their fans.

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.

With our corporate philosophy of ~Internet for everyone~, we are developing a wide range of businesses, including Internet infrastructure, online advertising and media, Internet finance, crypto assets, and AI-related businesses.

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.

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.

Agileware specializes in agile development, primarily using Ruby, and offers solutions to enhance productivity and well-being. Our flagship products include the project management tool "Lychee Redmine," the well-being app "KIWI GO," the meeting minutes tool "GIJI," and the personalized habit-building app "VINE." We prioritize diversity, innovation, and flexible working styles through a flat organizational structure. To promote work-life balance and sustainable growth, we have implemented a biweekly four-day workweek with 153 annual holidays. Agileware is committed to developing software that supports users in addressing challenges and thriving in dynamic environments.

Qiita is a technical knowledge sharing and collaboration platform for engineers. Qiita is a place where users can connect with other engineers through the articles.

"Greatly Satisfy IT Engineers."
Qiita, Inc. hopes to accelerate changes in society and the evolution of the world through the development of software, and we contribute to the improvement of the development efficiency of the engineers who support it.

Qiita has been developed using Ruby on Rails since first launch. We are convinced that the power of Ruby on Rails and the flexibility of Ruby has contributed to Qiita's growth.

"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.

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.

Vonage has everything you need to build connected applications with our APIs for SMS, Voice, Video, Verify and more. Whether you want to make and receive phone calls with code, reach users by the messaging platforms they prefer or ensure that users provide the correct contact details, we’ve got you covered. You can also easily integrate with social chat apps such as Facebook Messenger, WhatsApp and Viber, or build in-app voice and messaging experience on mobile and web. We also support open-source libraries for Ruby that enable you to build scalable communications features such as two-factor authentication, notifications, group messaging and calls.

Findy helps engineering organizations and individuals improve their development experiences. Founded in 2016 and based in Tokyo, the Engineering Intelligence products, Findy, Findy Freelance, Findy Global, and Findy Team+ are trusted by over 120,000 software engineers users and over 1,000 companies from start-ups to enterprises.

Money Forward is a SaaS/fintech company, providing PFM (personal financial management) service “Money Forward ME” and back office SaaS “Money Forward Cloud”.
Since the company's establishment in 2012, our aim has been to solve financial issues of all individuals and businesses through building an open and fair financial platform, thriving to be a player that brings innovative ideas and practices to all users.

Net Protections has been a pioneer in the BNPL (Buy Now, Pay Later) sector since 2002, when it launched 'NP Atobarai,' Japan's first BNPL service that covers non-payment risks. Building on its expertise and experience with 'NP Atobarai,' the company has since diversified its offerings to meet various market needs, including B2B, in-store purchases, and international markets.

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.

primeNumber is a data technology company.In an era of explosive growth of all kinds of data, We build an environment where anyone can use data quickly and easily,Optimize the process of data utilization.With advanced technology and unique ideas,We support businesses around the world with advanced technology and unique ideas.

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 22 categories in both out-of-pocket and insured care categories with a track record of over 4 million consultations.

Unifa is a start-up company in the Childcare-Tech domain that aims to solve social issues related to childcare, with the purpose statement of ‘creating a new social infrastructure that creates family happiness around the world’. It also promotes and develops the concept of the ‘Smart Nursery’. The system has already been introduced in approximately 60 municipalities nationwide, with more than 20,000 Lookmee series services in use (*as of April 2024).

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 introduced 180,000 companies.
Optimal Biz is helping IT managers introduce corporate DX.

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.

MIXI, Inc. is committed to enriching communication and inspiring moments of joy for friends and families with services like mixi, MONSTER STRIKE, FamilyAlbum, and TIPSTAR. By placing User Surprise first and putting depth and meaning over quantity and frequency, we hope not only to connect minds but to touch hearts as well.

JetBrains is a global software company that creates professional software development tools and advanced collaboration solutions trusted by more than 15 million users worldwide.
RubyMine is an intelligent AI-powered cross-platform JetBrains IDE that provides all essential tools for Ruby and Ruby on Rails developers out of the box. It offers smart code completion and analysis, easy code navigation, safe automated refactorings, an interactive debugger, Git workflow support, database integration, and many other tools. All tools are integrated together in a highly customizable, productive, user-friendly environment.

Flatt Security, based in Tokyo, offers expert security assessments and penetration testing for software. Our seasoned professionals deliver proven, top-tier services. We also provide tools to help you internalize cutting edge, state of the art security practices.

Tabelog is the best way to find restaurants and review them in Japan.
From 2005, we have accumulated over 72 Million Reviews and data for about 870k restaurants. We help "Over 96 Million People" find their best restaurant with scores based on the reviews. Along with our Search Service, we also provide a Booking Service, Credit Card Payment Service and so on. Since 2007, we have been developing Tabelog with Ruby. We're hiring Rubyists! Help us build further splendid service.

The aim of our mission "Ruby × Pioneering the future with innovative technology" is to contribute to society by evolving Ruby language as well as utilizing it to integrate new technologies into our society.
In addition to expanding Ruby language, our mission also implies that we are commited to supporting, nurturing, and producing more Ruby Engineers (Rubyist).

WED,Inc. was founded in 2016.

In 2018, we released "ONE", a mobile app that turns receipts into cash. The app attracted users with the complete new experience that had never existed before. The number of downloads exceeded 85,000 on the first day on the AppStore, and won the first place in the overall ranking. Currently, the cumulative download records over 6 million, and we have more than 1 billion receipt data.

We will continue to create exciting new experiences.

KOMOJU (by Degica) is the leading cross-border payment gateway for Japan. Our Ruby-powered digital payment technologies provide businesses and developers the access they need to succeed across the world. We are active supporters of the Ruby community and our engineers are prominent contributors to the Ruby ecosystem.

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.

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.

TOKIUM is developing multiple BtoB/SaaS to realize its aspiration of "creating a time that leads to the future for those who aspire to a better world".

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 100,000 organizations, including Disney, Cloudflare, GitHub, Slack, Instacart, Atlassian, and Riot Games.

Fastly’s powerful and programmable edge cloud platform helps the world’s top brands deliver online experiences that are fast, safe, and engaging through edge compute, delivery, security, and observability offerings that improve site performance, enhance security, and empower innovation at global scale. Compared to other providers, Fastly’s powerful, high-performance, and modern platform architecture empowers developers to deliver secure websites and apps with rapid time-to-market and demonstrated, industry-leading cost savings. Organizations around the world trust Fastly to help them upgrade the internet experience, including Reddit, Neiman Marcus, Universal Music Group, and SeatGeek. Learn more about Fastly at https://www.fastly.com, and follow us @fastly.

Our mission is Shaping Future Software, crafting the next generation of relationships between companies and individuals. We specialize in developing AI solutions and offering AI SaaS, leveraging proprietary algorithms in machine learning and deep learning. Our offerings span a broad spectrum of technologies, including natural language processing for automated responses, image and video recognition, and predictive modeling. By providing solutions tailored to our clients' unique challenges and deploying AI SaaS to tackle common issues, we aim to facilitate the widespread adoption of software in society. Our goal is to foster a world where people and software evolve in tandem, creating a richer, more connected future.

RECEPTIONIST is a cloud-based platform that simplifies visitor management, appointment scheduling, and meeting room bookings for Japanese businesses. By automating check-ins and centralizing processes, it enhances efficiency, improves the visitor experience, and allows staff to focus on essential tasks.

Medley is a technology company whose mission is to provide innovative solutions for the medical and healthcare industry.
Our company provides services such as JobMedley, an online recruiting platform for the medical and healthcare industry; and software solutions, such as CLINICS, that aim to improve the operational efficiency of medical institutions and the medical experience of patients.
Our products have been developed by a team consisting of engineers, designers, and medical professionals; and we challenge ourselves every day to develop and deliver creative products that make people's lives better.

"Offers" is a specialized job matching service for product development professionals, including engineers, designers, and Product Managers (PdMs). Through direct job offers to registered users and job postings on "Offers Jobs," we facilitate connections between companies and product development talent, supporting both individual career growth and business development. Officially launched in September 2019, Offers is now used by over 30,000 product development professionals across Japan.

DeNA (pronounced "D-N-A") aims to entertain and to serve through our businesses, under our mission to delight people beyond their wildest dreams. DeNA's major business areas are in mobile games, sports, live streaming, healthcare, and automotive.

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.

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.

mruby/c is a lightweight implementation of the Ruby language, specifically designed for embedded systems using single-chip microprocessors.
We are dedicated to using mruby/c to make embedded systems development more accessible and efficient.