Cyber Defense Infrastructure Support Engineer

Leidos; Suitland (MD); On-site; USD 108,000 - 195,000; Full time

Benefits offered by this job

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Job summary

Leidos is seeking a Cyber Defense Infrastructure Support Engineer in Suitland, MD. The role involves building, configuring, integrating, and maintaining security systems for TS/SCI networks.

You will provide Tier 3 escalation support, leading engineering and administration of cybersecurity capabilities across complex environments. You will also develop documentation, conduct training on tools and processes, and support RMF activities, with a focus on Windows/Unix/Linux environments and

Qualifications

• Bachelor’s degree in Cybersecurity, IT, Information Assurance, or related field; Master’s preferred.
• 15+ years of relevant professional experience in lieu of a Bachelor’s degree.
• Active TS/SCI clearance in DISS.
• 10+ years of LAN/WAN technologies and Windows/Linux environments.
• 6+ years integrating, implementing, and operating cybersecurity tools.
• Knowledge of SIEM platforms (Splunk, Microsoft Sentinel, Elastic).
• Familiarity with vulnerability management (Nessus, Retina, SCAP).
• Experience with virtualization (VMware, Azure VMs, VirtualBox).
• Scripting/programming: Python, Perl, Ruby, JavaScript, PowerShell, C, C++, Java.
• Experience with ServiceNow and enterprise cybersecurity tools.

Responsibilities

• Research and evaluate emerging cybersecurity technologies for enterprise use.
• Lead engineering and system administration for new cybersecurity tools.
• Install, configure, integrate, and maintain cybersecurity tech across networks.
• Perform hardening and RMF activities to meet DoD requirements.
• Provide Tier 3 technical support including root cause analysis.
• Support Windows and Unix/Linux OS/applications across environments.
• Assist with cybersecurity tool integration, upgrades, and lifecycle management.
• Validate interoperability of new tech with existing capabilities.
• Develop and maintain system diagrams, docs, and procedures.
• Develop and deliver training on cybersecurity tools and processes.
• Support annual cybersecurity exercise planning and execution.

Skills

LAN/WAN networking

Windows

Unix/Linux

Tier-3 escalation support

SIEM

Vulnerability management

RMF / DoD security

Virtualization

Scripting languages

ServiceNow

Education

Bachelor’s degree in Cybersecurity/IT/Info Assurance

Master’s degree preferred

15+ years experience in lieu of degree

Tools

Splunk

Microsoft Sentinel

Elastic

BeyondTrust Retina

Tenable Nessus (ACAS)

SCAP

VMware

Azure Virtual Machines

VirtualBox

Python

PowerShell

Perl

Ruby

JavaScript

C

C++

Java

ServiceNow

Job description

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.

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, 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 $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline onlyand 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.

About Leidos

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 .

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits .

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.

REQNUMBER: R-00190143

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.