業務内容

• Lead day-to-day security threat management and incident response across the organization.
• Identify and manage potential incidents; collaborate with partner teams on known/suspected threats.
• Support threat intelligence, threat hunting, intrusion detection, and incident response following best practices.
• Participate in a 24/7 on-call rotation; communicate updates to stakeholders during incidents.
• Identify and develop new detection use cases; optimize existing detections to reduce false positives.
• Collaborate on technical directions and solutions with other teams.
• Research and analyze patterns in security events across X’s global infrastructure.
• Identify, design, and lead threat hunting missions to quantify and reduce threats.
• Manage and support log collection, security scanning, intrusion detection, and other security systems.
• Design and assist in automation to reduce false positives and automate event handling.
• Analyze the security posture of systems via testing and vulnerability impact analysis.
• Drive continual improvement in processes, procedures, and automations.

技術スタック

必須スキル

• 2+ years of information security experience
• Strong Python scripting for security automation
• Knowledge of networking; familiarity with macOS, Windows or Linux
• Cloud security fundamentals and practices (vendor-agnostic)
• Experience deploying/managing security technology
• Experience building queries and dashboards for security monitoring
• Knowledge of current threats/techniques; strong willingness to research
• Experience with malware analysis, forensics or penetration testing
• Problem solving/troubleshooting

歓迎スキル（該当する場合）

• Certifications like CISA, CRISC, CGEIT, Security+, CASP+ (preferred)
• Elastic/OpenSearch or similar platforms
• Open Source security automation tooling

キャリア成長観点

• グローバルなインフラを横断する高度なセキュリティ運用、脅威情報、 Threat Hunting の経験を積める。
• 検出機能・自動化・プロセス設計を組み立てる機会があり、組織全体への影響度が高い。
• セキュリティ分析ツール（クエリ/ダッシュボード）や自動化スキルを体系的に強化可能。
• 24/7のインシデント対応を通じた対応力・コミュニケーション力が鍛えられ、上位職種（シニアセキュリティエンジニア、Threat Hunter、セキュリティプログラムリード等）への道が開ける。