Blog - LINE ENGINEERING

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FIDO at LINE: FIDO2 server as an open-source project
Kyungjoon Park2021-10-07
Kyungjoon is an engineer on the Security R&D Team.
Hello, this is Kyungjoon from the Security R&D team. I work as a FIDO (Fast Identity Online) engineer. Continuing from our last post FIDO at LINE: A First Step to a World Without Passwords, I would like to introduce you to FIDO2, and also share my experiences from participating in the interoperability testing event hosted by the FIDO Alliance earlier this year in March. Lastly I will talk about our very own LINE FIDO2 server, which will be made available as an open-source project. Introduc
- Security Engineering
- Open Source
Profiling a simple performance issue in a JVM-based server
Mickey Donaghy2021-09-17
Mickey likes to use tools and types to make software better. He works on backend server systems at LINE, particularly the location platform.
I work on the backend code that supports some of LINE's location-based features, and we've recently had an exciting project to improve our support for keeping track of nearby points of interest (PoIs) — shops, museums, anything you might want to know that you were close to.In order to deliver this as quickly as possible, we elected to reuse an existing PoI datastore from a previous project — which meant we had to read the data from MongoDB. Although I'd worked a little with MongoDB in an existin
How we added settings searching to the LINE app
Steve (Nghia Nguyen)2021-08-11
Steve is an iOS Engineer on the App Dev 2 team
LINE has become a large platform that is host to a myriad of features over the years, and with each new feature added, so were new menus and items added to the settings menu as well. With more than 47 settings menu and 185 items that cover everything from personal info, themes, permission, and notifications to name a few, it has become increasingly difficult for our users to find the exact settings that they want to adjust. If one did not know exactly where a certain setting was, they would hav
Customizing Armeria metrics
Seunghwan Joo2021-08-04
Seunghwan is in charge of LINE OpenChat back-end development
In my last post, Monitoring Prometheus metrics from Armeria, we took a look at how you can monitor Armeria metrics using Grafana. In this post, I would like to show you how you can customize Armeria metrics to suit your needs. The sample code in this post uses the same sample code from Monitoring Prometheus metrics from Armeria. Customizing metrics prefixes using MeterIdPrefixFunction In the last post I mentioned that you can customize the default prefix appended to metrics by us
- Server-side
- Armeria
- Java
Monitoring Prometheus metrics from Armeria
Seunghwan Joo2021-07-09
Seunghwan is in charge of LINE OpenChat back-end development
In this post, we'll be taking a look at how you can monitor Prometheus metrics collected with Armeria. For those of you who are trying Armeria for the first time, I will be adding simple practice samples so that you can follow along. Practice exercise The practice session was designed on macOS Big Sur. Let's now take a look at how you should install and configure Gradle, Prometheus, and Grafana to run the samples, and see what the results are. Configuring Gradle
- Server-side
- Armeria
- Java
[Team & Project] Introducing the Team Developing Web Front-end for LINE User Services
LINE Engineering2021-05-24
LINE Engineering Blog official account
The Team & Project series introduces each department and project in the LINE development organization, providing detailed information on their roles, structures, technology stacks, future issues, and roadmaps. In this article, we’d like to introduce you to the team that is responsible for the web front-end of our user services. We spoke with Daisuke Shimizu, Ryota Agata, and Leonard Ken Orihara from the Front-end Development Center. *This article is a translation of a Japanese artic
TECHTALK #3 Event Recap
Vu Khanh Mai Anh2021-05-07
Employer Branding
Hi, this is Mai Anh from Employer Branding. Last month we held the third episode of TECHTALK, the bi-annual tech event series by LINE Technology Vietnam, where we connect with Vietnam's skilled developers and share LINE's best practices with large-scale applications and services to the community. It was a team effort to bring TECHTALK #3 about, so firstly I'd like to express my deepest gratitude to everyone who participated, presented, and involved in the organization of the event. Right afte
- TECHTALK
- LINE Technology Vietnam
Web Styling with ReactJS
BachNX2021-04-29
UIT Engineer at LINE Technology Vietnam
I'm Ngo Xuan Bach from User Interface Technologies (UIT) team. We've worked on Charmmy and several services of LINE 占い (LINE Uranai, or LINE Fortune).In this post, we will talk about how we implement web styling with ReactJS, the problems we've met, and how we propose to solve them. 0. Our problem when deciding on a styling method The introduction of ReactJS has completely changed the way we build web applications. Just after a couple of years, ReactJS has become one of the most popular Front
Diagramming software architecture using C4 model and C4-PlantUML
Jeongil Kang2021-03-17
I am a technical writer in charge of writing and managing the LINE documentation.
Hello, all. My name is Jeongil Kang, and I'm a technical writer at LINE. How are you all doing? I can't help but ask about your well-being first amid the ongoing COVID-19 pandemic. COVID-19 has brought a lot of changes to our lifestyles. Among those changes, one of the more noticeable ones was that most conferences have shifted to being held online. While I was there in person to attend Write the Docs Prague back in 2018, it went online in 2020 so I had to participate remotely. I
- Technical Writing
Intern Report – Cross-lingual text-to-speech synthesis via domain adaptation and mutual information minimization
Detai Xin2021-02-19
Hi everyone, my name is Detai Xin. I joined the LINE Speech development team for my summer internship during July 2020 to October 2020. The goal of my internship program was to publish the research outcome at a prominent conference. During these three months, I developed and implemented a method for obtaining a disentangled speaker and language representations for cross-lingual text-to-speech synthesis. Our paper "Detai Xin et al., Disentangled speaker and language representations using mu

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