Job Description
ISI Defense is seeking an experienced Senior SOC Analyst to serve as a senior member of the Security Operations Center. This role is responsible for leading complex investigations, handling high-priority escalations, supporting proactive threat hunting, and improving day-to-day detection and response operations across internal and client environments. The Senior SOC Analyst is a senior hands-on analyst who helps strengthen operational maturity within the SOC by providing technical leadership during escalated incidents, improving detection quality, and mentoring junior analysts. This role supports security operations in regulated environments aligned with Defense Industrial Base requirements. Key Responsibilities Investigate and respond to complex security alerts, suspicious activity, and escalated incidents across endpoints, identity, email, cloud, and network environments. Initiate and coordinate containment, eradication, and recovery actions in accordance with established playbooks. Make real-time containment and escalation decisions during active incidents. Serve as the senior analyst for high-priority alerts and incidents, helping determine scope, impact, and recommended containment actions. Perform proactive threat hunting using SIEM, EDR/XDR, threat intelligence, and behavioral indicators to identify suspicious or malicious activity. Support detection tuning and continuous improvement of alert logic, correlation rules, and SOC workflows to reduce false positives and improve visibility. Analyze and correlate security telemetry across enterprise tools to identify account misuse, suspicious behavior, and indicators of compromise. Support monitoring and investigation in a Microsoft-centric environment, including endpoint, identity, email, and cloud-based security events. Work within modern XDR workflows, including experience with CrowdStrike XDR and comparab