Infrastructure Security Engineer / Security Center / Service Infrastructure

  • Tokyo
  • Partial Remote
  • Full-time
  • December 28, 2022
Apply from Anywhere 👍
Relocation to Japan 👍
(Overseas visa sponsorship supported)
Language Requirements
Japanese: Conversational
English: Business Level


Infrastructure security team is a global engineering team that designs, builds and operates LINE entire cyber infrastructure.

Specific business examples

  • Review, build, operate and improve measures to protect large-scale service infrastructure and business environment infrastructure
  • Design and implementation of new service security architecture
  • Provide security guides to engineers, business teams and partners involved in various LINEs
  • Enforce security checks on LINE infrastructure and improve methods
  • Security automation


  • Risk assessment and automation
  • Vulnerability-based infrastructure risk assessment (experience on Enumeration standards such as CVSS Scheme and CPE)
  • Threat-based infrastructure risk assessment
  • Security Warranty
  • Enhancing security vulnerabilities
  • Hardening design/implementation for Server OS (Linux/Windows), Client OS, Service Platform, Open Source
  • Access Control for Linux (RHEL, CentOS), Windows environments (IAM, PAM, ZeroTrust, AD, LDAP)
  • Review, build, operate and improve protection measures (Security Platform DevSecOps)
  • Security automation
  • Review, build, run and improve Endpoint Security
  • Review, build, run and improve System/Data Security
  • Review, build, operate and improve Key Management (SSL/TLS Certificates, KMS, HMS)
  • Review, build, run and improve Security Management (Elastic Stack, Splunk, etc.)
  • Experience of the role of security architect
  • Security architecture design and implementation for new services
  • Security-related standards-based security operations
  • ISO27001, SOC, PCI-DSS, SOX

Preferred Qualifications

*Design, construction and operation of various service infrastructure environments

  • Public Clouds (AWS, GCP, Azure, etc.)
  • Private cloud (i.e. OpenStack and other IaaS technologies, Kubernets and Container technologies like Docker)
  • Large infrastructure (tens of thousands or more)
  • A master's degree in computer science or related fields

*Use two or more of the following languages at the business level

  • Japanese, English, Korean, Chinese

Working Hours

One of the followings will be applied: Discretionary labor system for professional work (Employee is deemed to have worked for 9.5 hours a day, regardless of the actual number of hours worked), Flex-time system (core time: 11:00 am–4:00 pm) or 10:00 am–6:30 pm(actual working hours 7 hr 30 min)
*To be determined after the interview process


Weekends (Saturdays and Sundays), national holidays, paid leave, New Year’s holiday, congratulatory and condolence leave, "Refreshment" leave (every 5 years, employees who have been employed under a continuous contract are entitled to 10 days of paid leave)


Annual salary system (To be determined based on skills, experiences and abilities after discussions)

  • Annual compensation will be divided into 12 months and paid on a monthly basis.
  • Separate incentives available (*1)
  • Compensation revision: twice a year
  • Allowances: commuting allowance, LINE Pay Card Benefit Plan (*2)
    (*1) In addition to your annual compensation, you may receive incentives (twice a year) depending on the company's and individual performance and evaluation on your performance. (Incentives are not guaranteed to be provided. An incentive payment will only be paid if you remain employed as of the payment date.
    (*2) This is an allowance separate from the salary meant for employees to use for their health, personal development, support for raising the next generation, and more.


  • Employment insurance, workers accident compensation insurance, health insurance, employees pension insurance


  • Periodic health checkup
  • Company events and others



*Implementation of second-hand smoke prevention measures

[Prohibiting Indoor Smoking (other than Smoking Room)]
Shinjukul, Osaki, Minami-shinjuku, Yotsuya
[Prohibiting Indoor Smoking (outdoor Smoking Area)]
Shinuku (NEX), Nishi-shinjuku



Details to be shared during interviews.

LINE is the most popular communication app in Japan, Thailand and Taiwan. The diverse platform is continuing to grow rapidly throughout Asia, expanding services around the globe.

Under its corporate mission of "Closing the Distance," we strive to bring people around the world closer to each other, to information, and to services.

Our vision is to become the “life infrastructure” for its users, always ready to fulfill their needs, 24 hours a day, 365 days a year.

With mobile-focused projects in a wide variety of areas including communication, contents, entertainment and others, LINE is expanding into projects related to development, operations, advertising, Fintech, AI, Blockchain and more.


LINE is a global development team with development centers in more than seven countries. Based on the messenger service, we develop and operate various services such as fintech, news, games, and music services.


LINE is a service with more than 185 million MAUs and handles traffic for a variety of services based on this user in real time.


LINE has the ability of the best engineers in each field to develop the best services. It creates individual growth in a global engineering culture.

LINE's policies during COVID-19 are as follows

We’ve introduced a number of initiatives to support our users in Japan and around the world:

  • Remote consultations with medical professionals and one-on-one counseling for those suffering from anxiety and stress stemming from COVID-19 (working w/ Japan’s Ministry of Health, Labour and Welfare)
  • Enabling most of the employees to work from home
  • Moving to conducting recruitment interviews over video chat
  • Shifting all contracts to electronic form to allow those who handle contracts to work from the safety of their homes

    You can find more details about our initiatives in response to the spread of novel coronavirus here
View LINE's company page

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