This position is closed and is no longer accepting applications.

Security Research Engineer

LINE Corp. Shinjuku-ku, Tokyo
    💴 No salary range given
    🏡 Partially remote
    🧪 Minimum years of experience unspecified
    💬 Fluent Japanese
    🗾 Japan residents only
    🧳 No relocation support

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

  • Provide guidelines for and consult on LINE’s system and service architecture and design 
  • Develop security and authentication modules (e.g. FIDO and cryptography) for LINE’s services
  • Research and study emerging security standards and technologies


To learn more about the kind of work you’ll do, see our presentations “Strong customer authentication & biometrics using FIDO” and “BITBOX: How to Secure Cryptocurrency Exchange”.

Required Qualifications

  • Masters or equivalent work experience in relevant fields
  • 3+ years of relevant work experience
  • Experience programming in C/C++, Java, Python, etc.
  • Experience with two or more of the following:

    • Network protocols and secure network design
    • Web application and browser security
    • Android and iOS security
    • Security risk assessments and penetration testing
    • Authentication and access control; Applied cryptography and security protocols
    • Development of security tools, automation or frameworks

Preferred Qualifications

  • In-depth knowledge of AI technologies such as deep learning
  • Experience in developing authentication systems
  • In-depth knowledge of security vulnerabilities and hacking
  • Knowledge of service operations

Language Skills

Ability to communicate in English, Japanese, or Korean. Bilinguals welcome.

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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