• Full-time

Publication date： 2026.11.05

[Agency/Tokyo] IT/Security Engineer

  • System Engineers / Infrastructure Engineers / Web Engineers / Game Developers
  • Tokyo
  • Salary： JPY 3,600,000 - 6,300,000
【紹介会社/東京】IT/セキュリティエンジニア
職種Position System Engineers / Infrastructure Engineers / Web Engineers / Game Developers
会社概要Company profile As a "digital creator production company," we aim to establish the social standing of engineers through solving our clients' challenges and through our own products, as a group of true professionals.
　Our company is not simply a staffing company for engineers. Through our Digital Talent Business, Contract Development Business, and Content Property Business, we create work opportunities and career opportunities for engineers, both inside and outside the company.

　Many talented engineers gather at our company, and by clustering our talent, we maintain stable business with more than 300 companies at all times, including major companies such as the Bandai Namco Group, the Recruit Group, and the Rakuten Group.

　Since our listing in 2014, along with the increase in the number of employees, we have steadily achieved growth in our business performance, and in the near future we aim to list on the Tokyo Stock Exchange Prime Market. Going forward, by participating in even better clients and projects, we can enhance the track record of our engineers.
仕事内容Job description The work we would like you to take on is security engineering duties, including formulating security policies, introducing Security by Design, and building security equipment.
• Formulating corporate security policies (such as ISMS), conducting risk assessments, and proposing countermeasures.
• Proposing security systems and organizational structures to clients and executive management.
• Design (Security by Design)
└Based on requirements definition, create security design documents for OS, firewalls, authentication systems, cloud, and so on.
└Consider structures that account for vulnerabilities across the entire network, servers, and applications.
• Implementation and construction
└Installation and configuration of firewalls and security equipment.
└Data encryption, management of access permissions (IAM, etc.), secure coding, and environment setup.
• Testing (vulnerability diagnosis and penetration testing)
└Perform simulated attacks on built systems and existing web applications to inspect for vulnerabilities.
└Static and dynamic analysis of source code.
• Operation and maintenance (monitoring and incident response)
└24/7/365 traffic monitoring and log analysis at the SOC (Security Operation Center).
└OS and software updates, and patch management.
└Root cause investigation and recovery work as the CSIRT (Computer Security Incident Response Team) when cyberattacks or information leaks occur.
We have stable business relationships with various companies, including top companies leading the web industry such as the Recruit Group, Rakuten Group, and CyberAgent Group.
Our employees join client projects as members of a production company, and can acquire a wide range of skills and know-how that cannot be achieved by staying at one company for many years!
応募資格Requirement ■Experience building and operating networks/cloud (AWS, Azure, etc.) for 36 months
■Experience operating and administering Active Directory for 12 months
■Experience introducing and operating security devices (FW / WAF / EDR / SIEM, etc.) for 12 months
■Practical experience in security incident response or log analysis for 12 months
日本語力Japanese level Business
雇用形態Employment type Full-time
勤務エリアLocation Tokyo
勤務時間Working hours 9:30-18:30 / 10:00-19:00
想定年収Salary JPY 3,600,000 - 6,300,000
条件・待遇Condition [https://www.e-xtreme.co.jp/career/environment/benefits/](https://www.e-xtreme.co.jp/career/environment/benefits/)

[Age]
55 years old or younger
[Salary]
Monthly salary: 300,000 yen～ 420,000 yen
Annual salary: 3,600,000 yen～ 6,300,000 yen
※Includes fixed overtime pay
[Employment type]
Regular employee or contract employee
※Determined at the time of job offer according to the applicant's preference and career history
Previous experience, skills, and abilities will be favorably considered in accordance with company regulations.
For regular employees, after joining (salary revision once a year), actual performance will be fairly evaluated and determined in accordance with company regulations.
[Working hours]
For the Extreme head office: 9:30～18:30 (break time 12:30～13:30, actual working hours 8 hours)
※May differ depending on the assigned project (e.g., 10:00～19:00, break time 1h, etc.)
[Number of hires]
Approximately 10 people
Estimated annual salary: 3,600,000 yen～ 6,300,000 yen
※Employment type: Regular employee or contract employee (determined at the time of job offer according to the applicant's preference and career history)
Employment type: Regular employee
[Work location]
"Tokyo and surrounding areas of Tokyo"
Ikebukuro head office, or assigned project (client) sites in Tokyo and surrounding regions
※If the client has a work-from-home system, you may be asked to work from home.
選考についてProcess Entry
↓
Document screening
Document screening will be conducted based on the entry information you submitted, as well as your resume (rirekisho) and work history (shokumu keireki-sho).
※For designers, the portfolio is also included.
↓
Interview (1–2 rounds)
Candidates who pass document screening will be interviewed either in person or via web by our interviewers.
↓
Job offer (conditions notification letter sent)
Those who accept will be invited to a session to explain the steps toward joining the company.
※Required documents will be provided at the onboarding explanation session.
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