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 NOSCThe 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 ResponsibilitiesDevelop 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
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+, PenTest+, 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
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, PowerShell)
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, 2026For 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.
The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.
Skills Required
- Active TS/SCI clearance
- Bachelor's degree in IT, Cybersecurity, or related field
- 12-15 years of relevant experience
- At least two certifications from specified list
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
What We Do
We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.
