Sponsors

Engineering Anytime Anywhere

Takeyu Web, an IT Software Company specialized in Ruby on Rails, aims to be Japan's most employee friendly company. Thanks to our flex time and full-remote policiy, employees are able to work anywhere, anytime.

We welcome anybody who looks for a better work-life balance and shares our vision for a better work environment.

BRINGING THE BEST EDUCATION TO EVERY CORNER OF THE WORLD

Every child deserves an opportunity to learn - an opportunity to create the future they aspire to. At Quipper, we harness technology to achieve just this. By creating technology that empowers educators and learners alike, we aim to break down barriers in learning to help learners realize their full potential.

Learnings SNS "Studyplus"
Studyplus is a free learning management mobile application which also offers SNS features and various process visualisation.
We are proud to be used by the most high school students in Japan as a study management application to keep getting motivated. Friends do wonders!
We also have a service "Studyplus for school", on top of Studyplus.
It allows teachers to track their pupils' progresses and plan ahead on behalf of them.

Starting with Find Job! in 1997, mixi Group expands the possibilities of communication under a mission of creating new culture with services including Japan's first social network mixi, and the multiplayer smartphone app Monster Strike. The group continues to challenge and develop new markets while enriching the lifestyles of people around the world.

Our company name M3 represents the three Ms of Medicine, Media, and Metamorphosis. Our company was founded with the goal of changing the world of medicine through making full use of the power of the Internet.

TenshokuDRAFT is recruitmennt service. Companies put out the job offer with annual income based on their skills and experience to IT engineers, just like the professional baseball draft.

Scout provides an APM (application performance monitoring) that helps solve memory bloat, performance abnormalities, and other issues. Our goal is to provide deep insights to developers with our intuitive user interface. We provide our APM for Ruby, Python and Elixir.

Tabelog is the best way to find restaurants and review them in Japan.
From 2005, we have accumulated over 26 Million Reviews and data for about 870k restaurants. We help "Over 150 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.

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 infromation technology which are targeting those who are associated with aging society in Japan and Asia Oceania since our founding in 2003.

MedPeer, Inc. is a company in HealthTech industry founded by a doctor in 2004 and our mission is "Supporting Doctors, Helping Patients". We provide a professional online social media called MedPeer for certified physicians to share insight of actual medical scene. Now it holds more than 120,000 physicians (one of three physicians in Japan). Using this doctor network as an asset, we also provide several healthcare services such as online medical consultation service and dietary support service. We use Ruby to develop our services, and we actively adopt useful tools.Our goal is reinvent healthcare with our asset of doctors' collective knowledge and latest technology.

Fastly helps the world’s most popular digital businesses keep pace with their customer expectations by delivering fast, secure, and scalable online experiences. Businesses trust Fastly’s edge cloud platform to accelerate the pace of technical innovation, mitigate evolving threats, and scale on demand. Founded in 2011, Fastly powers online destinations including Airbnb, GitHub, Alaska Airlines, Pinterest, Vimeo, The Guardian, and The New York Times. Learn more at Fastly.com and follow us on Twitter @FastlyJapan and @fastly.

Discourse is modern forum software for your community. Use it as a mailing list, discussion forum, long-form chat room, and more!

The EC Incubation Development Department has responsibilities of the development and the operation of various emerging EC services including Rakuma, Rakuten Delivery and so on, and EC related platforms. Even though it is an independent development group for each service, we regularly hold meetups beyond services and share knowledge across the group. It’s a department you can feel both business and self growth while contributing service development and operations.

FiNC Technologies is a health-tech startup specialising in preventive health care × artificial intelligence technology that holds a vision to "provide personal AI for everyone's wellness". We are a team of specialists in preventative healthcare and technology including doctors, pharmacists, nutritionists, dieticians, trainers, geneticist, life scientists, engineers, and data scientists.

Network Applied Communication Laboratory (NaCl) is made up of many members developing open source software including Yukihiro "Matz" Matsumoto, Ruby developer and NaCl fellow.
We are an open source company. Using open source and developing new software, we deliver the optimal system for customer.

Ateam is an IT company that plans, develops, and operates a variety of services including games and tools for smart devices, comparison and informational websites, e-commerce websites, and more.

Linkers Corporation provides the business matching platforms, focused on manufacturing.
Our mission is supporting to create good collaborations for manufactural proposals.
Linkers and LFB(Linkers For BANK), our services, are the platforms designed to extend customers' scope to find more suitable partners.

STORES.jp, Inc. empowers sellers with a brand following with tools that enable them to have fun while growing their business. Our product is an easy-to-use service for building e-commerce websites, STORES.jp, which is developed using Ruby on Rails. We hope to contribute to the advancement of Ruby by supporting RubyKaigi, which has had a great influence on the development of Ruby and Ruby communities.

In 2018, we integrated management with payment services provider Coiney, and established hey, Inc. as a holding company. Our mission is "Just for Fun," to support "fun"-driven economic development for small teams.

JetBrains creates intelligent, productivity-enhancing tools for software developers to simplify their challenging tasks and automate the routine ones. JetBrains RubyMine is the most powerful IDE (Integrated Development Environment) on the market today, specially designed for developers working with Ruby and Ruby on Rails. It is famous for its outstanding Code Insight features including code autocompletion, code navigation, language-specific inspections with quick-fixes, smart notifications, refactorings, and in-editor quick documentation. The IDE also provides a built-in test runner, debugger, VCS support, and other essential tools supporting cutting-edge Ruby technologies.

giftee is a Tokyo-based eGift company. We provide eGift services to both consumer and business clients to empower their communications with the power of eGift. Nearly 80% of Japanese eGifts are provided via our service, which is all built by Ruby. And now, we are enhancing our services to Southeast Asia from 2018.

"Tokubai" is a SaaS that innovates the conventional rule of retail promotion.
(As a No.1 platform of shopping information in Japan), It brings local consumers and retailers together through real-time communication and makes shopping experience much more convenient and fun.

GitHub is a development platform inspired by the way you work. From open source to business, you can host and review code, manage projects, and build software alongside 31 million developers.

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 "Bring a smile to everyone through work".

Degica is a leading provider of Japanese digital commerce solutions. Our Ruby-powered e-commerce and digital payment technologies provide global businesses and developers the access they need to penetrate and succeed in the Japanese market. We are active supporters of the Ruby community and our engineers are prominent contributors to the Ruby ecosystem.

Internet for Everyone
Since the GMO Internet Group began its Internet related business in 1995, we have striven to offer services that make the internet easier to use, richer, and more enjoyable under our corporate slogan "Internet for Everyone." Our goal through these services is to create a new internet culture and industry, to inspire and bring smiles to the faces of our customers, and to contribute to both society and people everywhere.

Stripe builds the most powerful and flexible tools for internet commerce. Whether you’re managing an e-commerce store, subscription service, on-demand marketplace, or crowdfunding platform, Stripe can help you easily accept payments and run your business effectively online. Millions of businesses of every size — from new startups to public companies like Salesforce and Facebook — rely on Stripe to run sophisticated financial operations and reach global customers with a single integration.

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.

We provide analysis and marketing automation features as a service.

Our service provides some quantitative analyses for mobile application and web application (ex. retention analysis, funnel analysis, KPI analyses).
Using the data collected and other user properties, we are also able to provide direct marketing towards particular user segmentations.

We at Agileware are a group of Agile developers and Ruby specialists and continually strive for excellence in our field. We optimise our work processes by taking advantage of managing our projects with our Redmine plugin suite "Lychee Redmine", writing meeting minutes online with our service "GIJI", while offering flexible working hours and the possibility to work remotely. To offer our clients and developers the highest value we are eager to learn the newest technologies while maintaining Ruby as our first language. To contribute to the spread of productive Ruby development we are also actively involved in training of Ruby programmers.

PR TIMES is the platform to connect companies to public audiences.
Our service can distribute unique releases with any design using the Editor. Every month, we have the leading number of page views, shares on social sites and the most significant press releases in all of Japan.
At PR TIMES, Jooto, Tayori and many other services developed by Ruby are also operated.

Akatsuki dreams of a society where emotion develops into rewards. People are content and act voluntarily in the society.
For the mainstay mobile gaming business, we develop and operate games to provide exciting user experience.
We also want to provide the world with excitement and connection through several businesses including the Live Experience business, where we provide real fun experiences.

Medley is a technology company whose mission is to provide innovative solutions for the medical and healthcare industry.
We offer four main services: MEDLEY is an online medical encyclopedia, JobMedley is a recruitment service for healthcare professionals, Kaigo-no-Honne is a senior care referral service, and CLINICS is a top telemedicine app used in over 1,000 clinics and hospitals. All of our products are developed with Ruby. CLINICS won Social Innovation Prize at Ruby biz Grand prix 2016.
Our products have been developing by the team consists of engineers, designers and doctors. We challenge every day to develop and deliver creative products that make people’s lives better.

At WOVN Technologies Inc., based in Tokyo, Japan, we're building a global platform for localizing the internet.

Our business and engineering teams develop customized solutions that reduce the burden and costs of in-house localization. Over 12,000 websites use WOVN.io for their localization and localization management.

We use agile development along with a modern, evolving tech stack built on Vuejs 2 and Ruby on Rails. WOVN.io has been built on Ruby since day 1, and we hope to contribute to the ruby development community in any way that we can.

Our mission is to remove all barriers to human thought and communication. On this journey we're humbled to be helping millions around the world from solo makers to research labs, from gamers to pro designers, and large to small teams like ours.
Our vision is to make saving, sharing, and exploring ideas as natural as breathing. We're working towards achieving that vision with our two services: Gyazo a seriously instant screenshot app and Scrapbox a surprisingly simple knowledge base.
We love coding in Ruby and are happy we can support the community.

With its mission "Delivering Happiness, One Ride At a Time", JapanTaxi has been using the power of IT to modernize the public transportation means that are taxis.
JapanTaxi is Japan's largest taxi app with a network covering all 47 prefectures, allowing its users to easily call a taxi from anywhere. On top of its dispatching platform, JapanTaxi has been developing its business widely: hardware and IoT development, BigData R&D activities, a payment platform accelerating the transformation of taxis into a cashless society and an advertising business leveraging taxi vehicles' assets.
As a core component of our dispatching platform, we wish to contribute to Ruby's development.

DWANGO Co., Ltd. pioneers the next generation of network communication in genres such as gaming and music. Our products include games, mobile music services, and "niconico douga"—a video sharing service with over 50 million registered users. We take pride our innovative ideas providing high quality content across various platforms.