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Introduction of panel discussions with guest speakers in LINE DEVELOPER DAY 2020

Hi, this is Momoki from the Developer Success Team.

During LINE DEVELOPER DAY 2020, scheduled to be held online November 25-27, 26 of the 156 sessions will be held in a multi-person panel discussion format with a theme.

「LINE DEVELOPER DAY 2020」Official Website: https://linedevday.linecorp.com/2020/en
List of Sessions:https://linedevday.linecorp.com/2020/en/sessions

In this article, you will find session summaries and speaker profiles for the 10 sessions that will be conducted in a panel discussion format with guests.

*Introduction to the sessions in lecture format, depending on the guest:Introduction of guest speakers and their sessions in LINE DEVELOPER DAY 2020

Day1 − Wednesday, November 25

Mix Track

14:40-15:20 Corporate IT Strategy for a New Way of Working

In this panel discussion, Mr. Hirose and Mr. Katano, in charge of corporate IT at Yahoo Japan Corporation and LINE Corporation, respectively, will talk about how they have prepared for and responded to the COVID-19 pandemic, where remote work has become commonplace. The MC will be Mr. Yoshino, in charge of IT strategies at LINE, who will host a lively discussion on the unique challenges and work faced by mega-ventures consisting of nearly 10,000 employees.

Masanori Hirose

Yahoo Japan / Information System Division Vice President

Hirose Masanori joined Yahoo Japan Corporation in 2006, where he worked as an infrastructure engineer in the IT system department before becoming a planning team leader. After leaving the company in 2009, he joined an internet life insurance company as a manager in charge of infrastructure, where he participated in getting the company up and running. Returned to Yahoo Japan Corporation in 2015 as the division head of the internal infrastructure department, then in 2017 was appointed as general manager, his current position.

Hideto Katano

LINE / Executive Officer Oversight of Enterprise IT and Growth development

Katano Hideto joined livedoor (now LINE) in March of 2009 and was in charge of service infrastructure. He was involved in service management, including LINE’s family services and livedoor blog. In 2013 he worked concurrently in a position overseeing the internal IT department. In 2016, after managing the launch of LINE Mobile, he was put in charge of building the tech-based LINE subsidiary LINE Growth Technology. In January of 2019, he was made a LINE executive officer.

Kazuya Yoshino

LINE / IT Strategy Department Senior Manager

Yoshino Kazuya is the director of the IT strategy department, which oversees implementation and operation of internal systems companywide. He continues to work from home with occasional interruptions by his family’s pet toy poodle and Shih Tzu.
Casual Track

16:40-17:20 Current progress on speech technologies and its future prospects

Speech processing technologies such as automatic speech recognition (ASR) and speech synthesis has rapidly progressed. Furthermore, new research fields such as acoustic scene/event detection have appeared. In this session, two engineers from LINE (Yusuke Kida and Ryuichi Yamamoto) will talk about current progress of ASR and speech synthesis. From Doshisha University, associate prof. Keisuke Imoto will talk about current progress of acoustic scene/event detection in which Japanese researchers made remarkable contributions, e.g., invitation of a flagship conference DCASE. Although progress of deep learning has a strong influence, we would like to deep dive into how specific elements in speech processing connects with deep learning and leads to technological progress. We would also like to discuss about common technological elements among speech processing fields and specific elements to clarify characteristics of each field, and we will discuss about future prospects.

Keisuke Imoto

Doshisha University / Associate Professor

Master at Kyoto Univ and Ph.D. at the Graduate Univ for Advanced Studies, SOKENDAI. Worked at NTT, NTT Communications and Ritsumeikan Univ. Associate prof at Doshisha Univ Faculty of Science and Engineering in April 2020, research and development of environmental sound analysis and synthesis. Received the Telecommunication Advancement Foundation’s Telecom System Technology Prize, the Acoustical Society of Japan’s Sato Prize, and more. Member of IEEE, IEICE, and the Acoustical Society of Japan.

Masahito Togami

LINE / Speech Team Manager & Principal Researcher

Dr. Togami joined LINE in 2018 after working as a visiting researcher at Hitachi, Ltd. and Stanford University. He is the manager of the speech team since 2020, which is a R&D team for speech recognition. He engaged in research and development work on sound source separation. He is the author of “Sound Source Separation with Python” in 2020. He obtained Ph.D. degree from the department of aeronautics and astronautics at the University of Tokyo in 2011. He is a board member of the Japanese Society for Artificial Intelligence, and a Senior Member of IEEE.

Yusuke Kida

LINE / Speech Team Senior Engineer

Yusuke Kiba worked at Toshiba, then Yahoo Japan Corporation, and finally joined LINE in May 2020. He is the lead engineer of the voice recognition research and development team.

Ryuichi Yamamoto

LINE / Voice Team Research engineer

Mr. Yamamoto joined LINE in 2018. He works in speech synthesis R&D at LINE KYOTO Office. Prefers Julia as a programming language, but mainly writes Python at work. He likes open source and new programming languages, cooking, games, and comics, etc.

Day2 − Thursday, November 26

Server Side Application Track

16:10-16:50 LINE x Yahoo: At the Forefront of Service Development

LINE and Yahoo! JAPAN are hard at work developing a variety of services in B2C, B2B, and numerous other domains. In this session, panelists in charge of development for advertising and business operations for each service talk frankly about the conditions faced during actual development. Tomihisa Fuon, from Gijutsu-Hyohron Co., Ltd., will be acting as moderator. They will discuss how each project came to be, how they were developed, how the teams were organized, early goals, how they handled legacy implementation and improvement processes, and more, giving a behind-the-scenes look at some of the largest services ever developed in Japan.

Koichi Sawada

Yahoo Japan / Development Department, Beauty Division, Vertical Services Group / Manager

I graduated in April 2008 and joined Yahoo Japan. I have mainly worked in developing Android apps and in frontend development for Yahoo! News, Maps, Bookstore, and other services.I am currently working on the development of Yahoo! BEAUTY. I use Node.js often, and I prefer writing plain Javascript over TypeScript. I have a cat (7 months old) and a dog (almost 2 years old)!

Ryo Higuchi

Yahoo Japan / Media, Production Department, Client Product / Manager

I was a software engineer for government institutions before joining Yahoo Japan in June 2011. There, I became involved in advertising services, and performed backend development for advertisement submission and review. In recent years I’ve overseen general UX for advertisement submission, working to improve UX tools to make operations more efficient and advertisements more effective. My most used language is Java, and I use the IntelliJ IDE. I like to think about how efficiently I can develop something based on its requirements. I enjoy working out and going to Japanese spas.

Tokuhiro Matsuno

LINE / Official Account Development Department / B2B Platform Development Department / Senior Manager

I manage developers as head of the Official Account Development Office and the B2B Platform Office. My role doesn’t involve much actual development, but web development using Perl, Python, Java, and Kotlin is one of my specialist areas. Recently I have been using Arch Linux.

Kazuhiro Osawa

LINE / Service Development Department1 / Senior Manager

After joining LINE, I developed a variety of services before heading up LINE LIVE. The organization expanded, and I now lead a development department that dealswith the entertainment businesses, including our ticketing business, MUSIC, LIVE. Outside of my own department, I also get involved in the coding tests we use for recruiting new graduates. My hobby is to support my bias, by using their various services just as a regular user, like offline and online concerts and special online events.

Tomihisa Fuon

Gijutsu-Hyohron / Cross Media Div. Manager

I was born in 1975 in Yokohama. In April 1999 I joined Gijutsu-Hyohron Co., Ltd. Ever since Japan’s Linux boom in 1999, I have been an active member of the open source community as a reporter, covering numerous events and forming relationships with the engineers there. I am currently the head of cross-media enterprises, focusing mainly on digital expansion. I’m a huge Yomiuri Giants fan and I like eating Japanese hot pot.
Client Track

13:00-13:40 Insider Stories from the Development of LINE and Yahoo! JAPAN’s Major Apps

Applications developed by LINE and Yahoo! JAPAN are used by most of Japan’s residents. We’ve invited Mao Nishi, who is in charge of producing Yahoo! JAPAN’s apps, and Akihiro Hayaishi, who coordinates the various development teams for LINE’s messaging app, to discuss the company cultures and development structures that enabled the development of their large-scale apps. They will shed some light on topics and challenges unique to such large-scale development.

Mao Nishi

Yahoo Japan / Smartphone App Management Department, CTO Office General Manager

Mao Nishi was involved in the development of the Yahoo! Shopping, Yahoo! Auctions, and other apps before joining the CTO office, where he works to formulate and promote technology strategies on a company-wide level. From June 2013, he received certification for creating a “Black Belt iOS App” under Yahoo!’s Black Belt system. The certification is renewed once a year, and he held it for three years. He has contributed to the education and growth of app developers by authoring the “Make Your First Serious iPhone App” series and hosting seminars both internally and externally.

Akihiro Hayaishi

LINE / Development Department 2 Senior Manager

Akihiro Hayaishi joined LINE in 2014. In addition to working on the development of the LINE messaging app, in July of 2019 he was appointed as the head of LINE development team 2, where he managesthe app’s various development teams and formulatestechnology strategies.
Client Track

17:20-18:00 Develop LINE’s messaging app in Kotlin

Kotlin has become “the first language” in Android app development. All new code in LINE’s messaging app development is written in Kotlin. In this session, with the main theme of “Develop LINE’s messaging app in Kotlin”, Hadi Hariri from JetBrains will answer questions from LINE Android App Development team about related to the latest release of Kotlin, Kotlin multi-platform, Kotlin compiler performance, future of Kotlin etc.

Hadi Hariri


Developer and creator of many thingsOSS, he has been programming in one way, shape or form since the age of 12. Author of various publications and courses, Hadi has been speaking at industry events for nearly two decades. Host toTalking Kotlin, he works atJetBrainsleading the Developer Advocacy team, and spends as much time as he can writing code.

Daniel Vila

LINE / Dev Team7 Software Engineer

Daniel joined LINE in 2018 and his primary role involves development of the LINE messaging app for Android. Part of his time developing has been improving code consistency and best practices across teams through the use of static analysis. He has been working on new features as well as overhauling and refactoring components to improve both the codebase and the user experience.

Masakuni Oishi

LINE / App Dev Team1 Senior Software Engineer

As an Android client engineer, he is involved in the development of LINE applications. He is also the main developer of LINE’s OSS library “Lich” https://github.com/line/lich
Frontend Track

14:20-15:00 Why Accessibility? The Reasons and How to Incorporate Solutions

For many, accessibility may seem at times to be an insurmountable hurdle. With over 80% internet adoption in Japan, more people than ever are using the web in workplaces that are adapting to new lifestyles. In this modern era, accessibility is essential for ensuring that information can reach users in every kind of situation and on every kind of device. Internationally, laws have been passed to ensure web accessibility, making the topic one of global interest. However, there are many who think accessibility is only approachable by companies who have the spare resources, or who are interested but have no idea where to start. This session is for people like that. We have invited 4 guests who have seen success in the Japanese accessibility field to host a panel discussion on the topic. The theme is “Why accessibility?” The panelists will discuss how they came to realize the importance of accessibility, how they’ve incorporated it into their operations, and how they’ve made it a staple in their organizations. They will also discuss what steps are necessary to make accessibility commonplace. We hope that this session helps you realize why accessibility should be for you.

Yoshiaki Ito

Maboroshi / Frontend Engineer

Yoshiaki Ito was born in Saitama prefecture in 1985. He worked in media companies creating web content for 6 years, and then developed 2 social games based on HTML and Javascript at a business firm. In 2015 he joined Maboroshi Co., Ltd. Specializing in accessible HTML structure and CSS design, he helped with many corporate sites and landing pages. Recently, he has been making business tools utilizing domain-driven development with Vue.js.

Soichi Masuda

CyberAgent / Developer Experts(Accessibility)

Masuda Soichi started in design software sales for manufacturing before joining digiper Inc., and finally joining CyberAgent, Inc. in January, 2017. After performing frontend development for the live streaming platform FRESHLIVE and the online betting service WINTICKET, he began working to promote accessibility both internally and externally. He is member of Working Group 2 (Implementation) of the Web Accessibility Infrastructure Committee (WAIC).

Kengo Hashimoto

LINE / Portal Company Design Department Senior Manager

Kengo Hashimoto is the head of the design team at LINE’s portal company. He joined in 2010 and has overseen the design of various services since. He leads the general design direction for LINE NEWS and LINE’s portal companies. Previously, he worked as an art director at a large contracting firm, serving many domestic clients. He has also worked at start-ups. In 2012, he received the gold Good Design Award prize the first time it was given for mobile apps.

Azusa Tomita

LINE / Front-end Dev Team1 Markup Engineer

Tomita Azusa has been building the HTML/CSS of services since 2011. He is involved in instituting internal markup guidelines, streamlining environments for implementation of sass, and more. In recent years he has been performing spec and browser implementation tests in order to improve accessibility. His main duty currently is LINE NEWS.

Takuma Hanatani

LINE / Front-end Development Center Senior Front-end Engineer & Advocates Lead

I work as a Front-end Advocates leader. I’m involved in maintenance of technical platforms across teams, DX improvements, and a wide range of activities for making UIT into the best Japanese front-end organization, including running meetups and setting up technical media. Privately, I maintain the official Japanese Vue.js documentation and Nuxt.js plugin, and often get involved in OSS activities on my days off.
Casual Track

3:30-14:10 Corporate culture and value of OSS for engineer development

ZOZO Technologies, Mercari, and LINE discuss engineering cultures that encourage the development of open-source software (OSS). LINE provides a number of tools as OSS, such as the SDK used to develop the wide range of LINE products. LINE engineers participate in these OSS projects voluntarily, and the company supports their contribution to OSS, and their growth as engineers. ZOZO Technologies revealed their “Open Source Software Policy” in April of this year. With a growing number of in-house users of, and contributors to, OSS, ZOZO Technologies have decided to promote OSS as a way to contribute to the industry, increase the appeal of their technology, and support their employees. Many of Mercari’s engineers have built on their experience of development at Mercari to release their own open-source tools, such as ShimmerView and Production Readiness Checklist. Mercari places great value on its engineering culture and is committed to maintaining it.We will debate the nature and value of OSS business activities with companies who contribute to OSS without looking to profit from it, and discuss how this affects their engineers.

Naotoshi Seo

ZOZO Technologies / SRE Specialist, Leader

I joined ZOZO Technologies in January 2019 as an SRE specialist. I started the MLOps Team in April 2019, and since April 2020, I have also been working as the Platform SRE Lead. I also get asked by the CTO Office to take on company-wide initiatives like the Open Source Software Policy and CSIRT from time to time. Outside the company, I work as a committer for CRuby and Fluentd. I like OSS, yoga and baths.

Hideyuki Nanashima

merpay / Engineering Office Software Engineer

I joined Mercari, Inc. in January 2017, and moved to Merpay, Inc. in January 2020. I’m involved in disseminating technology and recruiting engineers, with the aim of building a strong engineering organization. I’m also a member of the OSS Promotion Office, which is made up of members of the Software Engineering, Security, and Legal departments. We manage the Mercari Group’s OSS system. I love spreading the joys of Swift, and busying myself with the management of technical communities.

Joohoun Song

LINE / Technical Evangelism Team

I joined the company’s Technical Evangelism Team in May 2020, and in July, I started managing open-source software developed by LINE engineers in Japan. I spent around eight years working as a systems engineer in a wide variety of settings, including the development of large-scale systems and internal operational systems. Since then, I’ve used my technical expertise to set up a developer community and provide it with support, while also trying to revitalize the ecosystem sector. I’m most interested in technologies like OSS, API, and cloud computing, as well as the developer communities associated with them.

Day3 − Friday, November 27

Fintech | Blockchain Track

13:30-14:10 Frontline engineers discuss the feasibility of blockchain

The world has huge expectations for blockchain, and we have got to the stage where we’re preparing for its practical use. Three engineers on the frontlines of the country’s top-performing businesses in enterprise blockchain take another look at blockchain and discuss whether it is really useful and why we should adopt it. This session explores the appropriate use cases for blockchain, and goes through some initial questions clients often have when considering introducing blockchain, such as “How is it different from a simple distributed database?” and “Why is it better than API linkage?”

Gaku Nakamura

Oracle Japan / Solution Engineer

He was previously a financial systems integrator and gained experience in application development, maintenance, and project management related to bank-to-bank payments (Bank of Japan, SWIFT, CLS). Since joining Oracle Japan he has been responsible for the PaaS product blockchain infrastructure, and is engaged in considering use cases and consulting with customers, as well as architecture design, etc. He’s currently cooking healthy recipes to try and lose the weight he’s gained while staying home.

Shigeyuki Azuchi

chaintope / CTO

He started out developing libraries for Bitcoin and colored coins in 2015, and is now involved in the development and deployment of the enterprise blockchain Tapyrus, and the design and implementation of protocols required for the application of blockchain in various fields. He is a fan of JetBrains products and loves using RubyMine, CLion, and Intellij IDEA. His motto is “Develop with pleasure!”

Ryuya Nakamura

LayerX / Executive Officer ,LayerX Labs Director

He worked as a data-analysis engineer at Gunosy before he helped found LayerX. He works in blockchain research and development and has proposed numerous suggestions for and highlighted vulnerabilities in the Ethereum upgrade project Ethereum 2.0. He presented the world’s first peer-reviewed paper on the PoS protocol CBC Casper, and was the first person in Japan to receive a grant from the Ethereum Foundation. He has been studying the digital currencies of central banks and martial arts.
Product Management | Team & Process Track

14:50-15:30 What Makes a Good PM? A Good Engineer? Insight from PM and CTO

An essential role to partner with product managers is of course engineers. Although they may butt heads on occasion, it is an important complementary partnership that lets each role join in a shared purpose to create products that are loved and profitable by many. What is a good engineer from a PM’s perspective? What should a PM expect from an engineer? Conversely, what is a good PM from an engineer’s perspective? And what can an engineer expect from a PM? Mr. Niki, current executive officer and former PM for B2B platforms at LINE, joins Mr. Takeuchi, CTO at Visional, to shine some light on these questions in a panel discussion hosting a variety of perspectives.

Shin Takeuchi

Visional / CTO, Director

Shin Takeuchi joined FUJI SOFT in 2001 after graduating from an university with a degree in Computer Science. In 2007, he worked to develop company-wide shared infrastructure frameworks at Recruit, while also contributing to OSS activities. In 2008, he founded Lei Hau’oli. Soon afterward, he was involved in planning the start of BizReach, where he was appointed as CTO. In 2020, he was appointed to his current position. He is also on the board of the Japan Association of CTOs.

Shohei Niki

LINE / Executive Officer

After graduating from university, Niki Shohei began working at Recruit Co., Ltd. As a product manager, he planned hiring services and launched new business ventures before joining LINE in 2015. In 2019, was appointed as one of the youngest executive officers. Currently, his focus is business products responsible for monetizing LINE, such as LINE Official Accounts and advertising platforms.

Minoru Yokomichi

LINE / Effective Team and Delivery Department Senior Manager

As Head of the Effective Team and Delivery Department, he works on team and process challenges from a project-management and agile perspective. As a member of the organizational development task force ONE TEAM TF, he works with executives to design and carry out executive workshops and workshops about recruiting and training product managers. He’s hooked on taking photos with a 21:9 aspect ratio.
Mix Track

13:00-13:40 Team and Community: for safe spaces and business outcomes

The recent remote-working trend is said to have reduced commuting times and increased individual productivity. On the other hand, there are fewer opportunities for unplanned relaxed interaction with other people, and in some organizations, personnel are behaving more like machines. As a result, the idea of “community” within organizations is in the spotlight than ever before. The guest for this session is Yoshihito Kuranuki, founder of SonicGarden Inc., an organization whose staff of 50 were working completely remotely before the spread of COVID-19. He and Naotomo Watanabe, the Executive Officer in charge of the LINE Sticker Business, will discuss the difference between “team” and “community” in the context of new normal organizational systems and products, and how building communities sustains high performance.

Yoshihito Kuranuki

SonicGarden / CEO

Set up internal venture, building on experience of working for major systems integrator. Established Sonic Garden following a management buyout in 2011. Developed a zero-deliverable development vendor that offers consultancy services with fixed monthly fees and guaranteed results. Conducting business in new ways: all employees work remotely, no physical offices, no management, etc. Author of Chatting and Advice: Habits of Teams that Get Results, Better Results with Zero Management, and Everything Works Out If You Eliminate Deliverables.

Naotomo Watanabe

LINE / Sticker Business Department Executive Officer

After graduating from university, he worked in editing and mobile-content planning and development at Kobunsha, and in 2010 I started working at livedoor (now LINE). In 2012 I became involved in planning for the Stickers Business, and Ilaunched LINE Themes and LINE Creators Market. For about 10 years, I’ve been responsible for several different areas, including launching the paid B2C content sector, and growth hacking. I also manage strategy planning and execution for global developmentin Taiwan and Thailand among other places, as well as organizational management for overseas offices. I’ve been in my current role since January 2019.

That’s it – 10 panel discussion-style sessions with 10 guests. Please look for topics and speakers that interest you. Thank you for registering & attending.

Official Website:https://linedevday.linecorp.com/2020/en