Location: Suitland, MD
Clearance: Active TS/SCI
Leidos is hiring a hands-on Information Assurance Security Engineer (IASE) / Information Systems Security Engineer (ISSE) to support a complex, mission-driven enterprise environment in Suitland, MD.
In this engineering-focused role, you will actively secure, administer, harden, and maintain critical systems and infrastructure while collaborating across network, systems, cybersecurity, and architecture teams to continuously strengthen and evolve the organization’s overall security posture. You will combine deep technical security expertise with hands on engineering, vulnerability remediation, security testing, and architecture support to help protect mission critical systems and capabilities.
This role is open to candidates across a range of experience levels. The scope of the position and corresponding compensation will be aligned with the selected candidate’s background and expertise.
Primary Responsibilities
Serve as a primary security engineering resource for enterprise infrastructure, providing hands on administration, configuration, security hardening, troubleshooting, and vulnerability remediation.
Research and evaluate cybersecurity tools, technologies, and methodologies to identify opportunities to strengthen enterprise security.
Participate in architecture and engineering reviews and provide security recommendations for new capabilities, technologies, and infrastructure changes.
Troubleshoot complex security issues across storage, networking, operating systems, authentication, and enterprise infrastructure.
Conduct vulnerability assessments, ethical hacking, and penetration testing to identify and address security risks.
Review and harden storage protocols and services, including NFS, SMB/CIFS, iSCSI, and management interfaces, based on operational and security requirements.
Apply and validate applicable DISA Security Technical Implementation Guides (STIGs), Security Requirements Guides (SRGs), vendor security guidance, and industry security best practices.
Configure and maintain secure administrative access using technologies and principles such as SSH, HTTPS/TLS, role based access control (RBAC), centralized authentication, and least privilege.
Develop and deliver training on cybersecurity tools, technologies, and processes.
Required Qualifications
Bachelor’s degree in Cybersecurity, Electrical Engineering, Information Technology, Information Assurance, or a related field with 8+ or 12+ years of experience; Master’s degree with 6+ or 10+ years of experience. Additional relevant experience may be considered in lieu of a degree.
Active TS/SCI security clearance.
8+ years of security engineering experience, including experience with DoD RMF, ICD 503, and/or the NIST Risk Management Framework.
Extensive experience with Intelligence Community (IC), Department of Defense (DoD), Defense Information Systems Agency (DISA), NAVINTEL Cybersecurity, Fleet Cyber Command (FLTCYBERCOM), and DoDIIS processes, tools, systems, reporting mechanisms, and requirements supporting Assessment and Authorization (A&A).
5+ years of software development experience using Java, C, C++, or other programming or scripting languages, including experience designing and developing host based and network based scanning tools.
Experience with Security Content Automation Protocol (SCAP) based tools and specifications.
Experience installing, configuring, testing, deploying, operating, and maintaining enterprise network based scanning and reporting tools such as Trellix/ESS, ACAS, RedSeal, Evaluate STIG, SteelCloud ConfigOS, and STIG Manager.
Extensive experience hardening modern Unix operating systems, such as Oracle Solaris 10/11 and RHEL, as well as Microsoft Windows environments using Security Technical Implementation Guides (STIGs).
Extensive experience securing systems and software in accordance with IC, DoD, and industry security best practices.
Experience developing security controls, testing methodologies, and test procedures for systems, cloud based architectures, and Cross Domain Solutions (CDS).
2+ years of project management experience.
Demonstrated ability to take a proactive, results oriented approach while building effective customer and team relationships.
Required Certifications
Active IAT or IAM Level II/III DoD 8140 approved baseline certification, such as CISSP ISSEP or SecurityX, or the ability to obtain the required certification within 30 days of hire.
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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:September 14, 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.
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.
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