Sponsors

MedPeer, Inc. is a "HealthTech" company founded by a doctor. We operate MedPeer, one of the largest online community for doctors where 1 out of 3 doctors in Japan participate. We also provide other healthcare services. Our development language is Ruby, and we actively adopt useful tools. We aim to reinvent healthcare with a "collective intelligence" of 120,000 doctors accumulated on our platform and technology.

ANDPAD is No.1 product for home builders and renovators to have the site-work efficient and manage the gross profit of construction.
We have various features of products such as chat communication, ERP(Enterprise Resource Planning), chart management of work schedule, EDI(Electronic Data Interchange), cloud storage for all business-related documents, and report generating so we deliver integrated efficiency for making the industry work happier.

Our mission is “Make Creation Start Easily, and Carried On.“Launched in 2014, “note” is a media platform that enables creators to post texts, manga, photos, audios, and movies, and users to enjoy the contents and support them. We have over 20 million monthly active users and five million works posted on the platform.note will support the creative activities of all types of people and all types of organizations, and will continue to support them so they continue to create.

Tabelog is the best way to find restaurants and review them in Japan.
From 2005, we have accumulated over 34 Million Reviews and data for about 900k restaurants. We help "Over 100 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.

Get job offers from top 100+ tech companies.
Automatically analyze and visualize your contributions on GitHub, certify your programing skills.

Following the corporate philosophy of "User Surprise First," mixi Group is always working to exceed the imagination and expectations of users. Since 1997, mixi Group has created communication services for friends and family to enjoy together, including the social network mixi and the multiplayer mobile app Monster Strike. The group will continue to work toward enriching lifestyles of the future under the mission of "For Communication" by developing new businesses and services via IT to inspire communication around the world.

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.

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.

The mission of ZOZO Technologies, Inc. is to operation services and to develop technology that will help improve the entire ZOZO Group. ZOZO Technologies is a collection of those who are currently involved in technical productions, such as engineers, designers and analysts of the ZOZO Group companies.

ZOZO Technologies will also be in charge of operating “ZOZO Research”, which is our research institute. By applying the Strat Today Technologies’ expertise in innovation, we aim to achieve ZOZO Research’s mission of “Scientifically defining and predicting fashion”.

STORES makes it easy for anyone to create an online store with a professional look and feel. We enable creative and passionate entrepreneurs to enjoy long lasting business success though design and technology.

Keiken System is an independent software developer in Nagano. We have been working on software development and various services that meet the needs of the times.
We have built a deep trusting relationship with many users and developed the history of computer spread in Our Homeland.

We focused on Ruby early on and was certified "Ruby System Integrator Gold" in 2012 as the first software company in Nagano pref.
With the knowledge we have cultivated so far, we have achieved good results for customers nationwide.
We will continue to challenge evolving IT technology.

Forkwell is the Japanese largest portfolio service for engineers to measure and track their skill growth. Forkwell also provides job search/recruiting platform based on the portfolio so engineers can prove their skill by their work.

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 2019.

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.

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.

Being Co., Ltd is a software development company, established in 1984. We have been
developing and distributing various software for business use, one of which is
dedicated for construction industry and a best seller in this field. In addition,
we were successfully able to develop a first Japanese origin project management tool
based on Theory of Constraint, which has been helping to improve efficiency of
operation of manufacturing field mainly.
Our subsidiary company called Luxiar Co., Ltd has been engaged in developing software
with Ruby on Rails in particular and has been providing a lot of solutions
for its customers by using earned intelligence and experiences.

Money Forward is a fintech startup delivering tools to visualize and improve both individuals’ and SMEs’ financial health.
Our BtoC service “Money Forward ME”, is the largest personal financial management application in Japan.
Through web, smartphone and tablet, we automatically integrate data from over 2.6K data sources and deliver the service to more than 9.0M users.
Our BtoB service “Money Forward Cloud” is a SaaS based solution for back office optimization.
In return to the power of open source we have benefited since launch of our product, we have employed a fulltime committer to further enhance the Ruby community.
Simply put, Money Forward moves your life forward, and Ruby further.

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.

We are Ruby specialists developing mainly original products such as plug-in for Redmine and meeting minutes software with voice recognition in a stress-free and flexible environment (remote work, full-flex, MacBook Pro, wide sub-displays, comfortable PC chairs, height-adjustable desks, free choice of editor/library/flamework).

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.

GA technologies is a PropTech (Property Technology) company.
We run an integrative PropTech brand call RENOSY.
We striving to transform real estate dealings into a more familiar course of action through application of artificial intelligence and other advanced technologies.
Our motto is “Real And Tech.” We make effective use of AI and other technologies for house-hunting that is done by visiting each property on foot, and are attempting to transform business in property purchase and investment, which has been a daunting task for most people, into a more familiar course of action.