Abuser detection random forest model and hyperparameter tuning

Hello everyone, I’m Dekai Wah, currently an intern at LINE’s Game Security Department. In our department, we work on different facets of securing games from cheating behavior. These could range from obfuscating code to analysis of suspicious behavior on our game servers. In this project, my teammate Yoshiki Kusama and I analyzed the game data retrieved from our […]

LINE DEVELOPER DAY 2020 Speaker Interviews

I’m Miki from the Developer Success Team.

LINE DEVELOPER DAY is a technical conference for engineers where we will introduce the challenges and initiatives in the technical field of LINE’s various services. This year’s conference will be held online for three days from November 25th to 27th.

The official website for LINE DEVELOPER DAY 2020

The conference will offer over 150 sessions over 3 days, divided into specialized tracks for each technology area as follows

  • Day1 : AI/Data, Server Side LINE Platform, Security, Infrastructure, Corporate IT, Others
  • Day2 : AI/Data, Server Side Application, Client, Frontend, Test/QA, Others
  • Day3 : AI/Data, Fintech, Blockchain, Developer Product, OSS, Product Management, Team & Process, Design, Others

In order to give you a fragmented view of the conference content, we have released the movies of pre-interviews with the speakers. Since it’s difficult to introduce all the speakers, we’ve included 8 speakers from AI/Data, Server Side LINE Platform, Security, Infrastructure, Server Side Application, Client, Frontend and Developer Product. We’ve picked up a speaker from each category and asked them to give us an outline of the session they were in charge of, as well as a subjective view of what LINE DEVELOPER DAY 2020 is all about.

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.

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 of guest speakers and their sessions in LINE DEVELOPER DAY 2020

Hi, I’m Momoki from the Developer Success team.

We are pleased to announce that we have updated the session list for LINE DEVELOPER DAY 2020, which will be held online for three days from November 25th to 27th.

More than 200 people, mostly engineers from LINE and its affiliates, will be speaking at this year’s LINE DEV DAY, with a total of 156 sessions planned.
There will be 30 sessions (20 lectures and 10 panel discussions) with a total of 36 domestic and international guest speakers.

This article will provide a summary of the 20 guest lecture sessions at LINE DEVELOPER DAY 2020, as well as profiles of the speakers.

An intern’s tale of designing LINE’s firewall secretary

Greetings! Today I’m going to write about my experience as an intern working on LFMS – the LINE Firewall Management Service – and more specifically, how I designed a part of it called Service Risk Scoring. But first, let me quickly introduce myself. My name is Valeri Haralanov – in English-speaking contexts I go by the […]

【Team & Project】 Meet the team that is in charge of the LINE app’s messaging server development, as well as development and operation of the Apache Kafka Platform

The Team & Project series takes a look at different departments within the development organization at LINE Corp. (“LINE”) and introduces their roles, team structure, tech stacks, challenges that lie ahead, roadmaps, and more. In this edition, we sat down to chat with the team that develops the LINE app’s messaging server and develops and […]

Adding experimental WebAssembly support to Decaton – Part 2

In the 1st part of this article, we looked into how we can integrate WebAssembly runtime into a Java application. Then we faced a big limitation of current Wasm/WASI that it doesn’t support sockets, making most of the practical Decaton processors difficult to be hosted on it due to disabled network I/O. In this 2nd […]

Adding experimental WebAssembly support to Decaton – Part 1

WebAssembly is a binary instruction format for a stack-based virtual machine, which aims to be a compilation target of many programming languages to enable executing a program at any place like browsers, embedded devices, and servers with high portability, high performance, and sandboxing capability. Wasm recently caught my interest along with the Rust programming language, and I […]

On code readability – 1. Introduction and principles

Presentation overview Ever since starting development for LINE beginning in 2011, we have been continuously developing and improving features to provide a better user experience. The growth of the project resulted in an increase of 1.5 million lines of Android client code including modules, and the team expanded to more than 50 members. For such […]

Monitoring applications with Prometheus and Metricat

In this blog post, I would like to talk about the development of monitorable applications with Prometheus. I will also introduce one of the personal projects I work on in my free time which can help with the development of such applications – Metricat. Observability Observability has become one of the essential characteristics of modern […]