About LINE Corp.

Shinjuku, 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

In this position, you’ll be responsible for operating and performing API/web application development work for server-side features of LINE’s services. 

Our Stack

Our services are built on these technologies: Java, Spring Framework, RxJava2, Armeria, Nginx, MongoDB, Redis, MySQL, Elasticsearch, Prometheus, Grafana, Zipkin, Central Dogma, Ansible

External resources about the team and our services

  • LINE’s New Year campaign - Taking Control of High Traffic Video - Slides
  • LINT (LINE Improvement for Next Ten years) Video - Slides
  • Reliability Engineering Behind The Most Trusted Kafka Platform Video - Slides
  • Long road to microservices architecture at LINE messaging platform. Video - Slides
  • Implementation of service mesh using Envoy and Central Dogma Slides

Responsibilities

  • Lead the design of software components and features.
  • Design, develop, test, deploy, maintain and improve large-scale server-side software.
  • Contribute to architectural designs which can improve the efficiency and flexibility of our services.
  • Mentor and train team members on software design and coding standards.
  • Work closely with other teams on the development of end-user facing web applications.
  • Support the development of high quality code through active participation in code and design reviews.

Requirements

  • Extensive/strong capability at least one of Programming language: Java, C, C++, Scala, Erlang
  • Solid knowledge and understanding of computer science (e.g. use of standard algorithms and data structures, OS, network, database) with B.S. level or equivalent experience.
  • 5+ years of experience in software development, B2C services or large scale system.
  • Experience developing consumer services

Preferred Qualifications

  • Experience developing applications using Java 8+.
  • System architecture and design experience including but not limited to the following topics:  
    • Networking (HTTP 1.1/2, TCP/IP, DNS etc.)  
    • Scaling  
    • Micro-services, DDD (Domain Driven Design)  
    • RPC (REST, Thrift, ProtoBuf, etc)  
    • Asynchronous I/O  - MySQL(RDBMS, etc)  
    • NoSQL (Redis, HBase, MongoDB, Cassandra)
    • Design distributed system architecture.
    • Implementation of distributed transactions
  • Basic knowledge of client side technologies such as HTML, CSS and JavaScript.
  • Experience using a Linux/Unix development environment.
  • Experience in the coaching, management and/or leadership of a technical team.
  • Open-source software development experience and/or participation in open source communities is also a plus.
  • Work experience using version control systems (VCS), dependency management systems, and continuous-integration systems (CI).
  • Motivation to learn Japanese.

Meet LINE Corp.'s Developers

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...

Joining LINE from overseas

with Li Liu

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...

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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About LINE Corp.

Shinjuku, 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

Other Jobs at LINE Corp.

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