【日系テック大手】ITセキュリティエンジニア｜サイバー犯罪対策（派遣）

大手日系IT企業にて、フィッシング、不正アクセス、オンライン詐欺などのサイバー犯罪から大規模なデジタルサービスとユーザーを守るITセキュリティエンジニアを募集しています。

セキュリティエンジニアリング、脅威インテリジェンス、インシデントレスポンス、ソフトウェア開発を組み合わせて、実際に発生するサイバー犯罪を分析・調査し、自動化された対策を構築。

サイバーセキュリティ防衛に特化したチームの一員として、専門性をさらに高められるポジションです。

• 社内セキュリティチームや外部関係者と連携し、サイバー犯罪・オンライン詐欺への対策を設計、開発、継続的改善を進めていただきます。
• フィッシングや不正キャンペーンを検知・無効化する自動分析ツールやアプリケーションの開発・運用
• OSINT、ダークウェブ、クローズドメディアのリサーチ；新たなサイバー脅威、攻撃手法、不正行為のトレンドの分析
• フィッシングサイト、不正キャンペーン、その他のセキュリティインシデントに対するCSIRT・インシデントレスポンスの実行
• 不審なアクティビティの特定やサイバー犯罪調査支援（複雑なデータソースの分析など）
• その他、セキュリティエンジニアリング、脅威分析、防御技術の専門知識を活かしてサイバー犯罪対策部門の活動に貢献すること

Join a global technology and e-commerce leader in Tokyo as an IT Security Engineer, helping protect a large-scale digital ecosystem and millions of users from phishing, fraud, and emerging cyber threats.

Working within a specialised Cyber Security Defense and Anti-Cyber Crime team, you will combine cybersecurity engineering, threat intelligence, incident response, and software development to identify malicious activity and build automated countermeasures.

This role offers hands-on exposure to Python, SQL, OSINT, threat intelligence, CSIRT operations, phishing analysis, and security automation. You will investigate real-world cybercrime, analyse complex datasets, research emerging threats across the open and dark web, and develop tools that strengthen anti-fraud capabilities in Japan and globally.

• Design, develop, and continuously improve anti-fraud and cybercrime countermeasures through collaboration with internal security teams and external partners.
• Build and maintain automated analysis tools and security applications using Python and data-driven techniques to identify and disrupt phishing and fraudulent campaigns.
• Conduct OSINT, dark web, and closed-media research to identify emerging cyber threats, attack techniques, and fraud trends.
• Perform CSIRT incident response for active phishing websites, fraudulent campaigns, and other cybersecurity incidents.
• Analyse complex datasets using SQL and investigative techniques to identify malicious activity and support cybercrime investigations.
• Apply knowledge of HTTP, TLS, SMTP, and DNS to investigate network and web-based fraud techniques.
• Support collaboration with relevant external organisations and provide technical analysis that can contribute to law enforcement actions and criminal investigations.
• Contribute cybersecurity engineering, threat research, and defensive expertise to the dedicated Anti-Cyber Crime function.
• Identify opportunities to automate repetitive investigation and response processes, improving the speed and effectiveness of cyber defence.

必須条件 経験・資格：

• サイバーセキュリティ、サイバー犯罪対策、セキュリティエンジニアリングまたは関連領域での技術・エンジニアリング経験3年以上
• Pythonのプログラミング経験3年以上
• SQL上級（データ分析や調査クエリなど）
• サイバー攻撃やオンライン詐欺で利用されるネットワーク・Webプロトコルの知識（HTTP、TLS、SMTP、DNSなど）

• 顧客・ユーザーファーストの視点で、チーム体制でサイバー防衛に取り組む姿勢
• セキュリティ施策やプロジェクトを推進するリーダーシップ
• 常によりよいものを目指す、継続的改善意欲
• Code of Ethicsを遵守する倫理意識

• 日本語：ビジネスレベル以上（チーム内の連携や技術コミュニケーションができるレベル。母国語でない場合、JLPT N1〜N2目安）
• 英語：ビジネスレベル

• Java、C/C++、C#、Go、Ruby、Perl、Bash、PowerShellなど、Python以外のプログラミング言語の経験
• オブジェクト指向プログラミング（OOP）の実務経験
• CSIRT、SOC、セキュリティインシデントレスポンスまたはB2C/B2B環境でのセキュリティ対応経験
• サイバー犯罪、不正アクセスなどに関連する日本の法律・規制に関する知識

大手日系IT企業。

数億人規模のユーザーが利用するデジタルサービスを展開しています。

大規模なデジタルプラットフォームを安全に運営するため、サイバーセキュリティは重要な事業領域となっています。

大規模なデータと最新のセキュリティ技術を活用しながら、グローバルチームと協働してサイバー犯罪対策の専門性を高められる環境です。

• 大規模なデジタルサービスとユーザーをリアルなサイバー犯罪から守る経験を積める
• 現代的なインテリジェンスツールや自動化フレームワークに携われる
• CSIRT・犯罪対策のプロが集まったチームで専門性を高められる
• テックドリブンな企業文化で働きやすい

• 3+ years of technical or engineering experience in cybersecurity, cybercrime defence, security engineering, or a related field.
• 3+ years of hands-on Python programming experience, including development of tools, applications, or automation.
• Strong SQL skills for data analysis, investigative queries, and working with complex datasets.
• Strong understanding of network and web protocols commonly associated with cyber threats and fraud, including HTTP, TLS, SMTP, and DNS.
• Practical understanding of cybersecurity investigations, threat analysis, anti-fraud activities, or incident response.
• Ability to combine software engineering and cybersecurity knowledge to develop practical defensive solutions.
• Bachelor's degree or equivalent qualification.

• Strong team orientation with a customer-first mindset and the ability to collaborate effectively across technical and non-technical teams.
• Leadership potential and the ability to take ownership of security initiatives and project activities.
• Analytical and investigative mindset with a strong interest in understanding complex cyber threats.
• Passion for continuous improvement, technical innovation, and ongoing learning.
• Strong professional integrity and commitment to maintaining a rigorous Code of Ethics.
• Proactive problem-solving approach with the ability to investigate unfamiliar threats and develop practical countermeasures.

• Japanese: Intermediate to business-level proficiency required, ideally JLPT N1-N2, for team collaboration and technical communication.
• English: Intermediate to business-level proficiency for communication within an international technology and cybersecurity environment.

• Programming experience with additional languages such as Java, C/C++, C#, Go, Ruby, Perl, Bash, or PowerShell.
• Practical experience with object-oriented programming (OOP).
• Hands-on experience in CSIRT, cybersecurity incident response, or B2C/B2B security operations.
• Knowledge of Japanese laws and regulations relating to cybercrime, cybersecurity, and unauthorised system access.
• Experience developing security automation, threat analysis, or investigative tools.
• Familiarity with OSINT methodologies, threat intelligence platforms, or dark web research.
• Experience investigating phishing, online fraud, account abuse, or other cybercrime activity.

Our client is a global technology and e-commerce leader operating an extensive ecosystem of digital services used by millions of customers.

With large-scale digital platforms and continuously evolving technology, protecting users and services from sophisticated cyber threats is a critical business priority. Its dedicated Cyber Security Defense function combines security engineering, threat intelligence, incident response, automation, and anti-fraud expertise to address real-world cybercrime.

You will join a technically focused environment where cybersecurity professionals work with large datasets, modern security technologies, and international teams to strengthen the organisation's global cyber defence capabilities.

• Take on a high-impact cybersecurity role directly protecting millions of users and a large-scale digital ecosystem from real-world cybercrime.
• Work with Python, SQL, OSINT, threat intelligence, CSIRT, and security automation in a hands-on engineering environment.
• Join a specialised anti-fraud and Cyber Security Defense team focused on phishing, fraud, and emerging cyber threats.
• Work with large-scale datasets, modern threat intelligence capabilities, and automated security frameworks.
• Gain opportunities to lead high-visibility cybersecurity initiatives and collaborate with international security teams.
• Build specialist expertise spanning cybercrime investigation, incident response, software engineering, and threat intelligence.
• Work in a technology culture focused on engineering excellence, continuous learning, and innovation.
• Benefit from flex time, minimal overtime, and casual clothing.