Lead Cyber Defense Incident ResponderOn-site - TS​/SCI

Job Title

Lead Cyber Defense Incident Responder

TS/SCI (active, required)

Arlington, VA On-site

$175,000 to $180,000

DoD 8570 / DoD 8140 IAT Level II

The Cyber Defense Incident Responder (Advanced) is a highly experienced, analytical professional who performs hands‑on technical work while guiding and directing senior and mid‑level analysts. This role involves advanced threat detection, threat intelligence research, practical application of threat intelligence to operations, developing custom scripts, and understanding complex threat actor techniques used to compromise systems and evade detection. The ideal candidate has extensive operational experience defending highly secure enclaves, specifically navigating Top Secret/Sensitive Compartmented Information (TS/SCI) and Special Access Program (SAP) networks.

• - Lead a small team of advanced and mid‑level security analysts to provide Incident Defense () services for government clients, specifically tailored to the unique security constraints of TS/SCI and SAP environments.
• - Serve as the primary technical point of contact for complex threat hunting issues and mentor new  members to grow their skills and operational abilities.
• - Engineer advanced detection alerting rules for events reported by endpoints, cloud services, network devices, and other relevant event sources across classified enclaves. This includes utilizing Splunk SPL, Microsoft Kusto Query Language (KQL), Elastic Kibana Query Language, Carbon Black, Snort rules, or other pattern‑matching detection tools.
• - Proactively research new malware using hunting capabilities on malware repository services (such as Virus Total) and through established partnerships with other security researchers, ensuring all malware handling adheres to strict, classified network protocols.
• - Lead targeted phishing campaigns to help educate the workforce on the risks of social engineering and malicious attachments.
• - Lead purple and red teaming efforts as directed, conducting adversary emulation relevant to the architecture of highly classified networks.
• - Provide critical support to the NOSC and coordinate team schedules to ensure on‑call coverage for after‑hours, weekends, and holidays.
• - Maintain the toolkit utilized by the . Conduct research analysis on the latest cybersecurity tools, provide rationale to renew or deprecate current tools, and make recommendations for employing new technologies within the enterprise.
• - Perform comprehensive research and investigations with little to no oversight to locate information relevant to government requests, communicating findings effectively to clients (typically interfacing with government information security professionals).
• - Ensure that all written communication (reports, briefings, and alerts) is professional, high‑quality, free of errors, and clearly delivers actionable intelligence.

• - Bachelor's degree in Computer Science, Digital Forensics, or a related major with an emphasis on security preferred.
• - Six (6+) years of experience in Threat Hunting, Security Research, or Incident Response.
• - Demonstrated leadership skills, preferably in a formal leadership role.
• - Scripting experience.
• - TS/SCI clearance is required.

• - Advanced technical expertise in threat hunting, deep‑drive malware analysis, and the operational application of threat intelligence within highly classified (TS/SCI and SAP) network enclaves.
• - Demonstrated leadership and industry contribution, recognized as a subject matter expert within the defense or broader information security community for advancing incident response methodologies.
• - Proven track record of excellence in leadership, specifically in guiding, mentoring, and directing mid‑level and senior information security professionals during active cyber operations and crisis response.
• - Government/client service experience: extensive experience serving as a primary technical liaison,…