About the role
Join Mizuho as a Cyber Defense, Adversary Emulation Director!
The Cyber Defense organization within Mizuho Americas Services (MAS) operates under the CISO and is responsible for identifying, analyzing, and mitigating cyber threats across the Mizuho enterprise. The Adversary Emulation function play a critical role in proactively improving the firm’s security posture by leveraging vulnerability intelligence of real‑world threats, identifying systemic weaknesses, and driving remediation across infrastructure, applications, and cloud environments.
The Adversary Emulation Director leads Mizuho's proactive security functions, with primary responsibility for vulnerability management, threat intelligence, threat hunting, and red team operations across the enterprise. This role focuses on identifying, prioritizing, and driving remediation of real-world threats and across the enterprise, thinking like an attacker to emulating adversary tactics to continuously test and strengthen the firm's defenses.
The role combines deep hands-on offensive and threat expertise with strategic leadership, partnering with security engineering, incident response, and technology teams to translate threat insight into measurable risk reduction. Automation, AI-enabled tooling, and workflow orchestration are applied to scale these capabilities and improve analyst efficiency, but they supplement — rather than define — the core mission of vulnerability management, threat intelligence, threat hunting, and adversary emulation.