Cyber Defense Infrastructure Support Engineer
Location: Suitland, MD
Clearance: Active TS/SCI
Join a mission focused team supporting the Navy’s cybersecurity environment at the ONI Hopper Global Communications Center!
As a Cyber Defense Infrastructure Support Engineer in Suitland, MD, you will build, configure, integrate, and maintain the security systems that help protect critical TS/SCI networks and keep essential cybersecurity tools and services operating securely and reliably.
You will serve as a senior technical resource, providing Tier 3 escalation support, evaluating emerging technologies, and leading the engineering and administration of cybersecurity capabilities across the environment.
Responsibilities
- Research and evaluate emerging cybersecurity technologies and capabilities for potential use within the enterprise environment.
- Serve as an engineering and system administration lead for the implementation of new cybersecurity tools and technologies.
- Install, configure, integrate, administer, and maintain cybersecurity technologies across complex network environments.
- Perform network and system hardening and support Risk Management Framework (RMF) activities to meet applicable DoD security requirements and benchmarks.
- Provide Tier 3 technical support, including complex system troubleshooting, root cause analysis, and performance tuning.
- Provide operating system and application support across Windows and Unix/Linux environments.
- Support cybersecurity tool integration, upgrades, maintenance, and lifecycle management.
- Validate interoperability between new technologies and existing enterprise capabilities.
- Develop and maintain technical documentation, system diagrams, procedures, and user guides.
- Develop and deliver training on cybersecurity tools, architectures, technologies, and processes.
- Support annual cybersecurity exercise planning and execution.
Required Qualifications
- Bachelor’s degree in Cybersecurity, Information Technology, Information Assurance, or a related area of study desired; Master’s degree preferred.
- 15+ years of relevant professional experience in lieu of a Bachelor’s degree.
- Active TS/SCI Security clearance in DISS.
- 10+ years of professional experience with Local Area Network (LAN) and Wide Area Network (WAN) technologies, networking protocols, file systems, ports, services, and commands, including experience with Windows and Unix/Linux environments.
- 6+ years of professional experience integrating, implementing, and operating cybersecurity technologies.
- Knowledge of Security Information and Event Management (SIEM) platforms such as Splunk, Microsoft Sentinel, and Elastic.
- Experience with enterprise network management and cybersecurity tools.
- Knowledge of vulnerability management and assessment technologies such as BeyondTrust Retina, Tenable Nessus (ACAS), and SCAP.
- Knowledge of virtualization technologies such as VMware, Azure Virtual Machines, and VirtualBox.
- Knowledge of scripting and programming languages such as Python, Perl, Ruby, JavaScript, PowerShell, C, C++, and Java.
- Knowledge of ticketing and reporting systems such as ServiceNow.
Required Certifications
- Active IAT or IAM Level II/III DoD approved 8570 baseline certification, such as SecurityX CE or CASP certification, or the ability to obtain the required certification within 30 days of hire.
- Computing Environment (CE) certification 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:August 20, 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
- Bachelor's degree in Cybersecurity, Information Technology, Information Assurance, or a related field, or 15+ years of relevant professional experience in lieu of a degree
- Master's degree preferred
- Active TS/SCI security clearance in DISS
- 10+ years of professional experience with LAN/WAN technologies, networking protocols, file systems, ports, services, commands, and Windows and Unix/Linux environments
- 6+ years of professional experience integrating, implementing, and operating cybersecurity technologies
- Knowledge of SIEM platforms such as Splunk, Microsoft Sentinel, and Elastic
- Experience with enterprise network management and cybersecurity tools
- Knowledge of vulnerability management and assessment technologies, including BeyondTrust Retina, Tenable Nessus, ACAS, and SCAP
- Knowledge of virtualization technologies including VMware, Azure Virtual Machines, and VirtualBox
- Knowledge of scripting and programming languages including Python, Perl, Ruby, JavaScript, PowerShell, C, C++, and Java
- Knowledge of ticketing and reporting systems such as ServiceNow
- Active DoD-approved IAT or IAM Level II/III 8570 baseline certification, such as SecurityX CE or CASP, or ability to obtain it within 30 days of hire
- Computing Environment certification or ability to obtain it within 30 days of hire
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.
