Senior Threat Analyst
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Job Description
Senior Threat Analyst delivering threat monitoring, detection, and response for Sophos, a global cybersecurity provider. Leading investigations, threat hunts, and incident response for customer environments.
Responsibilities:
- Monitor, investigate, and respond to alerts generated by the Sophos security stack, including EDR/XDR capabilities
- Escalate and lead complex and high-severity investigations through resolution
- Lead technical responses to major security incidents, coordinating containment and remediation with customers and internal teams
- Mentor and coach Tier I and Tier II Analysts and quality-review case work
- Analyze suspicious activity to assess scope, impact, and risk
- Identify and respond to cyber threats across customer environments using approved playbooks and tooling
- Document findings, investigative steps, and outcomes in the MDR case management platform
- Plan and lead hypothesis-driven threat hunts informed by threat intelligence and adversary behavior
- Investigate phishing emails, suspicious binaries, and behavioral anomalies
- Improve detections by addressing false positives, coverage gaps, and detection logic
- Research threat actor behaviors, MITRE ATT&CK techniques, emerging IOCs, active exploits, and vulnerabilities
- Author and maintain playbooks, knowledge base articles, and documentation
- Participate in shift rotations and provide detailed handovers between global teams
- Manage case workflows and follow up with clients until resolution
- Engage with clients in English and Japanese via chat, phone, and tickets
- Contribute to Security Operations processes and provide tooling feedback
Requirements:
- 5+ years of hands-on experience in a Security Operations Center (SOC), Managed Detection and Response (MDR) environment, or cybersecurity-focused IT role
- Proven experience leading incident response efforts, including containment, mitigation, and recovery during active security incidents
- Strong experience with endpoint and network security tools, including EDR, XDR, IDS/IPS, and malware defense platforms
- Hands-on threat hunting experience
- In-depth knowledge of adversary tactics and techniques, including obfuscation, persistence, privilege escalation, lateral movement, and defense evasion
- Strong working knowledge of Windows operating systems, with additional experience in Linux or macOS environments
- Strong ability to analyze Windows event logs and other telemetry data
- Solid understanding of network traffic analysis, TCP/IP, routing, switching, and protocols
- Experience mentoring, coaching, or reviewing other analysts
- Bachelor's degree in Information Technology, Computer Science, Cybersecurity or related field, or equivalent practical experience
- Business-level Japanese (JLPT N2 or above, or native), written and spoken
- Business-level English, written and spoken
- Willingness to participate in shift work including nights, weekends and holidays
- Desirable: MITRE ATT&CK, SIEM platforms, SQL, OSQuery, PowerShell, and advanced cybersecurity certifications such as GCIH, GCFA, GCIA, GREM, OSCP, or CISSP
Benefits:
- Remote-first working model
- Employee-led diversity and inclusion networks
- Annual charity and fundraising initiatives
- Volunteer days
- Global employee sustainability initiatives
- Global fitness and trivia competitions
- Global wellbeing days
- Monthly wellbeing webinars and training
- Recruitment process adjustments to support applicants with disabilities or other needs
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