This position is closed and is no longer accepting applications.

iOS/Android Client Engineer, LINE app

LINE Corp. Shinjuku-ku, Tokyo
    💴 No salary range given
    🏡 Partially remote
    🧪 Minimum years of experience unspecified
    💬 Fluent Japanese
    🌏 Apply from abroad
    🧳 Relocate to Japan

About LINE Corp.

LINE Corp. Shinjuku-ku, Tokyo

At 83 million domestic users, or 65% of the population, LINE is Japan's most popular messaging application. It is also popular throughout Asia, boasting approximately 186 million users globally.

Key benefits

  • Build reliable systems at scale
  • Room to grow
  • Healthy work/life balance

About the position

Our Mission

Our team works on features and under the hood improvements for the Android and iOS clients of the LINE messaging app, doing our part to make LINE Corp’s mission of “Closing the Distance” into a reality. The app’s place in users’ daily lives means we go beyond simply developing new features: we strive to provide a stable application by constantly working on improvements.

About the Team

In addition to LINE’s other domestic offices, our team collaborates with colleagues in South Korea, Taiwan, Vietnam, and other overseas offices. With our members hailing from over 15 different countries, our Japan team itself is also cosmopolitan. We mainly use English for documentation and chats, and also communicate verbally in English at times. We use GitHub’s Pull Requests to review each other’s code and hold study sessions.

Team members actively contribute to OSS and are encouraged to attend and/or present at external conferences and workshops. Some of our members’ recent achievements include contributions to Swift, OSS for iOS and Android, and presenting at DroidKaigi, iOSDC, and AltConf.


Leverage your expertise to develop and improve LINE’s Android and iOS clients. Collaborate with planners, UI/UX designers, data scientists, business development teams, and other stakeholders.

Who You Are

You take initiative and go beyond your current role to boost team productivity through codebases, improving tools, and helping team members expand their knowledge. You endeavor to contribute quality output by proposing improvements for plans, development specifications, and tests.

Current Product Phase/Exciting Challenges/Opportunities

You’ll be involved in the development of the LINE client app, which is used by hundreds of millions of people in Japan and abroad (particularly in Asia). This means you’ll have the opportunity to be a part of the planning and development of an app that is popular both domestically and globally. Additionally, our codebase has grown massively in size since the LINE app was launched eight years ago. You’ll work on improving the codebase’s internal structure as well as the performance and UX of the app itself. Through code reviews that let developers learn and improve from one another, automated CI testing, and other workflows we’ve created, we ensure all the development work we do is sustainable.

Tools/Development Environment

Devices used in development:

MacBook Pro, iMac 5K, etc. (recommended configuration for development: Core i9 or better, over 32GB memory, over 1TB SSD) More than one device can be loaned upon request. Developers are also provided with extra monitors and standing desks.


Github Enterprise, JIRA, Confluence, LINE, Slack, Jenkins Use Thrift IDL to collaborate with other teams Android: Java + Kotlin (mixed project), Gradle, Kotlin coroutine, RxJava2, Feature Flag systems, etc. iOS: Swift + Objective-C (mixed project), Fastlane, XcodeGen, Bazel, etc.

Career Path

We have a leveling system that assigns you a “career level” based on performance expectations.

You can choose from three career paths after joining.

Individual Contributor: As an individual engineer, you’ll build on your technical skills and contribute to the team with your designs, codes, and reviews. Tech Lead: You will lead a small to medium-sized team of engineers in development and help them strengthen their technical skills. Engineering Manager: You will manage a medium to large-sized team of engineers and endeavor to maximize the team’s output. You’ll also have the opportunity to move teams when internal job postings open up once a year.


  • Japanese or English skills in addition to experience in one of the following
  • 3+ years of experience using Swift/Objective-C to develop native iOS apps
  • 3+ years of experience using Kotlin/Java to develop native Android apps

Preferred Qualifications

  • Basic computer science knowledge (algorithms, data structures, asynchronous I/O, databases, networks, etc.)
  • Knowledge of and experience with UI/UX design and development (custom views, interaction, etc.)
  • Knowledge of and experience with standard libraries, frameworks, and build tools
  • Knowledge of and development experience with hybrid applications (web/native)
  • Active contribution and participation in open source software and developer communities
  • Interest or previous experience in messaging services

Meet LINE Corp.'s Developers

Photo of Swapnali Koli

Joining LINE as a QA Engineer

with Swapnali Koli

Swapnali had been working at a Japanese company as a QA Engineer. Looking for a new challenge, she joined LINE, where she’s led their private cloud API automation project.

Read her story...

Li was working in Toronto when he was recruited to join LINE as a principal engineer. He tells his story of relocating to Japan.

Read his story...
Photo of Matthew Bailey

Growing a career in Japan

with Matthew Bailey

Starting as a server side engineer at LINE, Matt is now a software development manager. He shares his experiences of finding a job in Japan, and gives tips on how you can be successful at landing one too.

Read his story...

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