Introduction for Engineer_English

This is an introduction to LY Corporation's engineers.
It introduces the characteristics of the development organization, the technology stack, the culture and the system (updated in October 2025).

If you are interested in our engineering or working at our company, please also visit the following sites.

■ Information on technology
LY Corp Official website "Technology & Design":https://www.lycorp.co.jp/en/technology-design/
LY Corp Tech Blog: https://techblog.lycorp.co.jp/en

■ Recruitment information
Mid-career recruitment (engineers): https://www.lycorp.co.jp/en/recruit/career/job-categories/#j-0
New graduate recruitment (engineers): https://www.lycorp.co.jp/en/recruit/newgrads/engineer/

Transcript

1. Public © LY Corporation 2026.04 Introduction for Engineers
2. Public © LY Corporation Message From the CTO 1 Executive Corporate Officer, CTO Euivin Park As engineers, we focus on the user's perspective, leveraging new technologies and ideas to offer services that are convenient, enjoyable, and beneficial. Specifically, we strive to enhance personalization through machine learning and generative AI, develop innovative interfaces, and create new services using AI and big data as key drivers of change. The fusion of our skill and creativity allows us to deliver new value to users. By utilizing the diverse systems and data platforms at LY Corporation, we are empowered to tackle technical challenges that can directly impact users worldwide and leverage the scale that is unique to large platforms. Blend your creativity with the systems and data infrastructure and experience the moment they make a global impact. It is the skill and creativity of engineers that drive the delivery of WOW to users. Let's walk this path together and enjoy the changes our technology brings to the world.
3. Public © LY Corporation 2 01 Personnel and Organizations 02 Tech Stack 03 Information Sharing 04 Events and Contributions to the Industry 05 Growth Support Programs Contents for Engineers
4. Public © LY Corporation Personnel and Organizations 01
5. Public © LY Corporation No. of LY Corporation Employees 4 01 Personnel and Organization No. of Employees Approx. 10,400 - As of April 2025 - Permanent employees only 20s Around 1,900 (18%) 30s Around 4,350 (42%) 40s Around 3,150 (30%) 50s Around 1,000 (10%) By Age Group Engineers Around 4,800 (46%) By Job Type Planning Around 1,800 (17%) Corporate Administration Around 1,200 (12%) Designers Around 600 (6%) Others Around 100 (1%) Business Around 1,900 (18%)
6. Public © LY Corporation Engineering Organization Structure There are 4 domains, and each domain is responsible for service development. Development of common platforms, as well as areas such as Data & AI, service infrastructure, and security, are cross- functional and work across all domains. 01 Personnel & Organization Media Search Domain LINE Platform Domain（LINE Development, etc.） Commerce Domain Corporate Business Domain Content & Membership Domain Planning &Business CTO Domain（Data & AI・Service Infrastructure・Technology Solutions,CIO etc.） CEO Domain（Corporate Strategy、CISO、CDO、CGIO etc.） Engineer Design Planning &Business Engineer Design Planning &Business Engineer Design Planning &Business Engineer Design CFO Domain（Governance、Corporate etc.）
7. Public © LY Corporation Tech Stack 6 02
8. Public © LY Corporation Tech Stack 02 Tech Stack Back-end ・Java, Kotlin/Spring Boot ・Go, Python Infrastructure ・Database : Cassandra, HBase, MySQL, Oracle, PostgreSQL ・Messaging : Kafka, Pulsar ・Middleware : Envoy, Istio, NGINX ・Infrastructure : Private Cloud (OpenStack, Kubernetes) ・Container : Docker, Harbor, Kubernetes ・Monitoring : Prometheus, Splunk ・Security : Athenz ・Source Code Management : GitHub Enterprise ・Configuration Management : Ansible ・CI/CD : ArgoCD, CircleCI, Drone, Jenkins, Screwdriver.cd ・Testing: MagicPod Front-end ・TypeScript/Vue, React Native Apps ・Kotlin, Swift Here are some examples of the technologies we use at LY Corporation. We select and utilize technologies that enhance engineers’ efficiency.
9. Public © LY Corporation Information Sharing 8 03
10. Public © LY Corporation Internal Media 9 03 Information Sharing Tech Media Tech Media is a media outlet within the LY Corporation Technical Portal, our official tech intranet that consolidates essential information for LY Corporation engineers. Available information include company- wide technical strategies, tech exchanges both within/outside the company and across divisions, as well as interview articles with engineers across the LY Corporation Group (hereinafter the “Group”). Knowledge Sharing New technologies adopted with high priority by LY Corporation are listed and visualized. For example, we have launched an information-sharing portal on generative AI. Additionally, we provide an environment that encourages mutual information sharing among employees, featuring pages like "myTips," where employees can easily post their knowledge. Image Image Extensive information is available, and we have a culture that actively promotes mutual information sharing.
11. Public © LY Corporation Tech Blog External Media https://techblog.lycorp.co.jp/en 10 03 Information Sharing Tech Blog shares technical case studies, knowledge, and the Group’s development culture that underpin the services of LY Corporation and Group companies. The company’s editorial team provides writing support and advice to enable all employees involved in development to write and publish their knowledge. Tech Introduction Our corporate website introduces the company’s tech organizations. The website also features a message from the CTO, an overview of our technology values, and other related topics. It also provides links to our Tech Blog and sponsored events. https://www.lycorp.co.jp/en/technology- design/ Content Delivery X (@lycorptechjp_e) Speaker Deck (lycorptech_jp) LY Corporation's technical initiatives and culture are shared through social media such as X and Speaker Deck We communicate LY Corporation’s technology to external audiences in various ways.
12. Public © LY Corporation Events and Contributions to the Industry 11 04
13. Public © LY Corporation Tech Week 04 Events and Contributions to the Industry Tech-Verse This tech conference showcases the appeal of LY Corporation’s Product Group for engineers, designers, and project managers. At Tech-Verse 2025, we have hosted tracks across 12 different topics over two days, sharing past challenges and experiences. Participants also had the opportunity to directly interact with developers. Tech Week is a special annual event where LY Corporation's engineers, designers, project managers, and employees involved in product development gather from various countries and regions. Throughout the week, participants share past challenges and experiences and engage in hackathons. Hack Day At this event, participants develop their projects freely over a total of 24 hours (12 hours per day × two days) and make a 90-second pitch. Afterwards, they can get to experience each team's work at an exhibition. Global mixed teams also participate, making it a perfect opportunity to unleash creativity, strengthen bonds with team members, and enjoy meeting new colleagues.
14. Public © LY Corporation Internal Study Sessions Internal Tech Events 13 04 Events and Contributions to the Industry We regularly hold internal study sessions for LY Corporation engineers at offices across Japan. These sessions serve as opportunities for interaction across different departments and teams. Tech All-Hands Meeting This is a meeting where the CTO and technical executives share technology strategies with all engineers within the company. Information on development policies, organizational structures, and project progress are also shared, aiming to ensure that internal engineers can work efficiently and decisively. Extensive information is available, and we have a culture that actively promotes mutual information sharing.
15. Public © LY Corporation External Tech Events 14 04 Events and Contributions to the Industry In addition to sharing LY Corporation's technology with external audiences, we also engage in initiatives to invigorate the industry. Hack U External Study Sessions As a development support activity for students, we collaborate with educational institutions to organize hackathons and workshops. We regularly hold external study sessions for engineers at our offices across Japan. Not only do these sessions help spread information on technology, they also contribute to increasing motivation and enhancing the value of our company's engineers.
16. Public © LY Corporation Sponsored Activities Contributions to the Industry 15 04 Events and Contributions to the Industry Community Support We sponsor conferences and events across various technological domains. At sessions and booths, we engage in communication with attendees by introducing LY Corporation's technology and development. In addition to contributing to pull requests for open-source projects, we actively release and maintain our own open- source assets, provide financial support to open-source initiatives, and submit RFCs. Release of TypeScript Remove Gold sponsor of Vue.js We strive to contribute to the industry by sharing technical knowledge and supporting engineers in the community.
17. Public © LY Corporation Growth Support Programs 16 05
18. Public © LY Corporation Upskilling Opportunities 17 05 Growth Support Programs imaｇe Doctoral Studies Support Program This is a system designed to support employees who aim to obtain a doctoral degree while working. At LY Corporation, you can experience practical research and theoretical academic studies related to big data, which is one of the company's strengths. Note: Only permanent employees with at least two years of service are eligible. Those who qualify through the selection process receive a scholarship for their science doctoral studies (up to 1 million yen/six months) and one day of special paid leave per week. Support for Participation in Conferences Requiring Travel If you wish to attend a tech conference that involves travel, your organization may, at its discretion, allow attendance during working hours and cover the participation costs. Note: The decision to provide support is made on a case-by-case basis, taking into account various factors such as the budget set by each organization, the content of the conference, and participant information. Please note that participation is not guaranteed. Image: Adobe Stock Image: Adobe Stock There are opportunities available to foster the growth of motivated engineers and advance LY Corporation's technology.
19. Public © LY Corporation Technical Information and Learning Support 05 Growth Support Programs Technical Portal Tech Training Portal Tech E-Learning The Technical Portal is an official technical information portal of LY Corporation that aggregates essential information for engineers. It includes platform-specific information as well as technical knowledge such as guidelines. Examples of content: • Technical guidelines • Technical references • Technical knowledge This portal aggregates learning content for engineers. High-quality materials created by internal specialized teams and professional staff can be accessed whenever needed. Examples of materials: • Development rules and processes of LY Corporation to learn upon joining • Tutorials for internal platforms • Development insights (tuning, anti- patterns, etc.) • General development knowledge We offer “Udemy Business,” which allows access to highly rated courses on Udemy, as well as “O’Reilly Online Learning,” which provides access to technical books, videos, and live sessions published by O’Reilly and others. Learning during work hours is encouraged, creating an environment where employees can easily receive support from those around them. We also provide recommended content curated by professional talent within the company from a wide range of resources. Image: barks/imagemart Image: Mono_tadanoe/imagemart We provide an environment (technical information and learning support) that engineers can use whenever they want to learn or find the information they need, helping to drive their growth. Image: kiko/imagemart
20. Public © LY Corporation Business Support 19 05 Growth Support Programs imaｇe Developer Relations＆Education Developer Assistant There is a specialized team dedicated to creating an environment where engineers can focus on development and achieve results efficiently. This team handles meeting coordination, interpretation and translation arrangements, event operation support, visitor reception, and purchasing assistance. In our large-scale, multinational development environment, they build systems that enable smooth collaboration across teams. 画像：Adobe Stock 画像：Adobe Stock A specialized team dedicated to maximizing the outcomes of engineers’ development supports their growth. Through hosting events such as Tech-Verse and sharing insights via various tech media, we have teams that visualize our technological capabilities and promote interaction and knowledge exchange within internal and external communities. We also develop various programs and systems for engineers to support their output and growth, while strengthening our overall technology brand.
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