Senior Security Engineer in Manassas

The work includes guiding and reviewing build integrity and supply chain review to threat modeling our own tooling. If you have ever looked at a supply chain & development environment and immediately started listing the ways you would secure it, this is the job. You will be the person the team trusts to tell them when something is a real risk and when it is just noise, As an AI Security Integration Engineer on our team, you will bridge the gap between traditional security infrastructure and modern programmatic defense. You will guide the secure development and evolution of software vulnerability tooling. Your primary focus will be working with the development team to maintainmaintaining the tool security posture utilizing continuous ATO. review workflows and pipelines by leveraging Python, assessing robust API integrations, maintained exploring AI/LLM orchestration to rapidly scale threat detection and response capabilities. Support ATO and continuous vuln management.

• 8+ years of professional experience in security engineering, secure software development, or infrastructure security.

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• Experience securing and using agentic tooling for writing and maintaining production code, managing cloud infrastructure, and release management frameworks. \n

• Experience owning security outcomes for a technical product from ideation to production, and influencing engineering teams toward secure design without direct authority. \n

• Experience hardening software deployments, networks, and production infrastructure at scale. \n

• Experience securing software clusters for online/cloud as well as on-prem or air-gapped installations. \n

• Experience with threat modeling, vulnerability management, and secure development practices across first- and third-party code. \n

• Familiarity with NIST RMF, continuous ATO, and control automation. \n

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Minimum Qualifications:\n \n

• \n 15+ years Hands-on experience securing and hardening Linux systems at the OS and network layer \n

• \n Expertise in at least one scripting (Python ) \n

• \n Working knowledge of network protocols, cryptographic fundamentals, and key management \n

• \n Experience with infrastructure-as-code and containerization (Ansible/Terraform, Docker/Kubernetes) \n

• \n Experience administering or securing a CI/CD system (GitLab CI, Jenkins, or similar) \n

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Nice-to-have Qualifications:\n \n

• \n Experience working in accredited/classified environments, including cross-domain solutions \n

• \n Offensive security background - penetration testing, red team, or serious CTF experience \n

• \n Detection engineering or SIEM experience \n

• \n Experience with embedded, real-time, or otherwise constrained platforms \n

• \n Exposure to reverse engineering or vulnerability research \n

• \n Relevant certifications (CISSP, OSCP, GCIH) - useful, not required \n

• \n Non-human/agent and secrets management - short-lived credentials, scoping, and audit for autonomous actors, which is a genuinely different problem than human IAM. \n

• \n Sandboxing and egress control for code-executing agents. \n

• \n Familiarity with NIST AI RMF and the fact that continuous-ATO control automation now has to cover AI system controls, not just traditional ones. \n

• \n Using LLMs to accelerate the compliance grind control narrative drafting, evidence collection, POA&M triage. \n

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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:August 24, 2026\n\n \n \n \n \n \n \n

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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.

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Pay Range:Pay Range $131,300.00 - $237,350.00\n

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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.

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About Leidos

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n Kudu Dynamics is Leidos Owned Company, forged out of a decade of experience in computer network operations and staffed with talent who have built, overseen, and enhanced capabilities throughout the entire USG arsenal. Our team of hackers and engineers have experience spanning centuries of research, development, and operations missions - across desktop, mobile, IoT, and embedded platforms. Kudu Dynamics, a Leidos company is uniquely qualified to anticipate tomorrow’s threats and build the next of capabilities., Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.