Blog - LINE ENGINEERING

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LINE Open Source Sprint 2023: Contributing to your favorite open-source project during work hours
Donghyeok Kim, Jina Kim, and Seoyeon Lee2023-04-21
Runs open source operations at LINE
Introduction Hello from Donghyeok Kim, Jina Kim, and Seoyeon Lee. We are in charge of open source management at LINE and are currently working in the Developer Relations team and the Open Source Program Office TF to bring LINE's development culture closer to the open source development culture. In 2021, we introduced the LINE Open Source Sprint event in the article below. In this post, we'll share the process and results of LINE Open Source Sprint 2023. LINE Open Source Sprint 2021: Promo
- Open Source
The new way of managing Chat storage in the iOS version of LINE
Harley Pham2023-02-22
Harley is an iOS engineer at LINE Vietnam.
While mobile device storage capacity is getting bigger and bigger nowadays, user data is also increasing in size as well. Users can have tons of extremely high quality photos or videos which can eat away their storage capacity very fast. Moreover, digital content can be easily shared among users in many social media apps or messaging apps such as our own LINE app or Instagram to name a few. This data duplication can even put more pressure on device storage as well. Our LINE app is not only the s
- iOS
Improving the Messaging Server development process
Takatoshi Nao2023-02-12
Takatoshi is a developer of LINE's Messaging Server.
Hello, everyone. I'm Nao, a developer of LINE's Messaging Server. In 2014 we introduced a new development and release process for LINE Server (Blog post in Japanese only). Since then, the development environment and code has changed. In this post, I'd like to introduce the points that have been improved. LINE's Messaging Platform consists of many Server Applications. One of them, Messaging Server, is a platform responsible for messaging functions, and we're working on mu
- Server-side
Terraform for Verda - A journey of Infrastructure as Code for our private cloud
keke2022-12-26
Site Reliability Engineer at Verda Reliability Engineering team
Hello, I'm Keisuke Yamashita (keke) from the Verda Reliability Engineering team. In this post, I'd like to describe Verda's journey towards Infrastructure as Code and our vision of resource (for example, virtual machines, load balancers, Redis clusters) provisioning and management on Verda. This entry will also cover the necessary tooling preparations for using Terraform as a platform-wide resource provisioning and management tool. What is Verda? Verda is LINE's private
- Infrastructure
- Verda
【Internship Report】 Development of log analysis pipeline using Spark streaming
Ryosuke Unno2022-11-24
My name is Ryosuke Unno. I participated in the LINE internship program in the summer of 2021. As a university student, I study the application of reinforcement learning in video games. During this internship I joined Data Engineering Team 3 of the Data Platform Department. In this article, I'll introduce the activities I was engaged in during this internship period. Background and issues Currently, the Data Platform Department operates large-scale Hadoop clusters which offer over 300PB of disk c
A story of introducing data lineage into LINE's large-scale data platform
Shinji Shimamura2022-11-24
IU Dev Team manager, Data Platform Department
Hi, this is Shinji Shimamura from the IU Dev team in the Data Platform Division. The Data Platform Division operates a data analysis platform with a size of approximately 400 petabytes. This data platform, called Information Universe (IU), collects, processes, analyzes, and visualizes data generated from LINE’s various applications so that LINE employees can utilize them. My team, namely the IU Dev team, has been developing "IU Web", which is used by every service in the LINE Group, provid
2022 UIT Online Global Workshop
Hansol Park2022-10-12
LINE UIT Front-end developer
Hello, everyone. I'm Hansol Park who is developing the front end in LINE+ UIT organization. UIT is LINE's front-end organization that develops a variety of services while also developing and operating the relevant tools required by those services. Engineers from Korea, Japan, Thailand, Taiwan, and Vietnam collaborate to share technology and grow together (for Korean UIT organizations, see LINE Engineering Team Introduction Page). In this article, I'd like to share the news of the 2022 UIT Global
- LINE Events
- Front-end
Improving LINE MUSIC performance by migrating to Vue 3
Shibasaka Hiroyuki2022-09-16
Front-end Engineer at LINE KYOTO
Hi, I'm Shibasaka Hiroyuki, a front-end engineer at LINE Kyoto development office. Do you listen to music on your computer while working or studying? Not only is LINE MUSIC available as a smartphone app, it's also available as a web application. The web app that we've developed, uses Vue.js as its JS framework. LINE Music (web app) Previously, this web app had used Vue 2, but in June 2022, we newly released a version upgraded to Vue 3. In parallel with function development for this web app, my
Kotlin JDSL: Let's use Kotlin to easily write reactive Criteria API
Hyunsik Kang2022-09-08

This is the second post in a series about Kotlin JDSL. In the last post, Kotlin JDSL: Writing JPA Criteria API more easily with Kotlin, we looked into the background of why we developed Kotlin JDSL and how we use it. In this post, we'll be looking at Kotlin JDSL Reactive modules. While many of you might have a preconceived notion that JPA cannot be reactive, Hibernate released a reactive JPA library called Hibernate Reactive. If you would like to know more about reactive programming,
- Server-side
- Open Source
Kotlin JDSL: Writing JPA Criteria API more easily with Kotlin
Jonghyon Seo2022-08-25
Jonghyon is a commerce platform engineer at LINE.
Hello, my name is Seo Jong Hyon and I'm part of the Global EC (Global E-Commerce, GEC for short). The GEC mainly uses Spring as its server framework, and JPA as its ORM technology. We've so far used the query method provided by Spring for simple queries and a combination of JPA Specification and Criteria API for more complex queries, but both libraries have some inconveniences. We started work on developing a library that does not have these inconveniences, and this library
- Open Source

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