Cyber Threat Hunter Security Clearance

Position: Cyber Threat Hunter with Security Clearance
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- Description Leidos is seeking a highly motivated and experienced Cyber Threat Hunter to join our DHS NOSC Cyber Team. This role supports the Department of Homeland Security’s mission to protect its enterprise-wide information systems from cyber threats through proactive monitoring, intrusion detection, and security services. The ideal candidate is process-driven, inquisitive, and skilled at identifying patterns and anomalies in complex datasets. About DHS NOSC The Network Operations Security Center (NOSC) is a U.S. Government program responsible for preventing, identifying, containing, and eradicating cyber threats across DHS networks.

NOSC provides monitoring, intrusion detection, and protective services for DHS information systems, including:
* LAN/WAN infrastructure
* Public-facing websites
* Wireless and mobile/cellular networks
* Cloud environments
* Security devices, servers, and workstations NOSC oversees the overall security of DHS enterprise systems and investigates and reports suspected or confirmed security violations. Primary Responsibilities
* Develop threat models to assess the DHS IT enterprise, identify defensive gaps, and prioritize mitigations
* Author, update, and maintain SOPs, playbooks, and work instructions
* Use threat intelligence and models to formulate threat hypotheses
* Plan and execute threat hunt missions to validate hypotheses
* Proactively search systems and networks for advanced threats
* Analyze host, network, and application logs, malware, and code
* Prepare and present risk analyses and threat findings to stakeholders
* Recommend and assist in developing new security content (e.g., signatures, alerts, workflows, automation)
* Collaborate across teams to enhance threat detection, response, and overall security posture Basic Qualifications
* Active TS/SCI clearance; must also obtain a favorable Entry on Duty (EOD) determination from DHS HQ
* Bachelor’s degree in IT, Cybersecurity, Computer Science, Information Systems, Data Science, or Software Engineering from an ABET or NCAE-C designated institution
* Minimum 12-15 years of relevant experience (SOC Analyst, Incident Responder)
* A bachelor’s degree may substitute for up to 1 year of experience
* A master’s degree may substitute for up to 2 years of experience
* At least two certifications from the following:
Security+, Pen Test+, Cloud+, GSEC, CEH, CCE, CFR, CySA+, GCFA, GCIA, GCIH, GDSA, GICSP
* Strong ability to work independently; self-starter and self-motivated
* Must be a U.S. Citizen

Preferred Qualifications
* Expertise in network and host-based analysis and investigation
* Experience planning and executing threat hunt missions
* Understanding of enterprise network architecture (routing, switching, firewalls, proxies, load balancers)
* Completion of military cyber training courses: 4-11-C32-255S (CP), 4C-255N (CP), or 4C-255A (CP)
* Working knowledge of networking protocols (HTTP, DNS, SMB, etc.)
* Familiarity with Windows and Linux operating systems
* Proficiency in scripting languages (Python, Power Shell)
* Experience with Splunk SPL and/or Elastic DSL
* Proven ability to triage and respond to APT activities
* Experience with cloud and container platforms (AWS, Azure, O365, etc.)
* Deep understanding of the cyber threat landscape and adversary tactics
* Prior experience on a federal government threat hunt team, especially DHS or DoD If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:
March 23, 2026 For U.S. Positions:
While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above. Pay Range:
Pay Range $ - $ The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or…