Sr. Network & Systems Engineer

Leidos LLC; Fort Belvoir (VA); On-site; USD 92,000 - 167,000; Full time

Job summary

Leidos is seeking an experienced Systems Engineer to provide high-level analysis, design, and leadership for DoD networks. The role includes advising leadership, coordinating with mission partners, and ensuring secure, reliable operations within the NOSC framework.

The position requires DoD security clearance readiness, deep knowledge of network protocols, Active Directory, and ITIL/ITSM processes, with shifts spanning day and night coverage to support global enterprise networks.

Qualifications

• BS degree in Computer Science, Information Technology, or related engineering with 8–12 years of experience, or a Master’s with 6–10 years of experience in enterprise systems engineering, network design, or IT operations management.
• High-level technical experience may be considered in lieu of a degree.
• Familiarity with DoD directives and security baselines is required.

Responsibilities

• Apply advanced systems analysis to consult with leadership and mission partners, determining complex system specifications and architectural roadmaps.
• Document, test, and modify network configurations and security protocols to align with security baselines.
• Lead NOSC operations watch duties and act as escalation authority for multi-system outages.
• Evaluate third-party solutions and manage configurations within ITSM frameworks.
• Interface with Mission Partners and senior leadership; prepare AARs and technical briefings.

Skills

Systems analysis

Network engineering

Incident leadership

Executive briefing

Vendor evaluation

ITSM processes

Security baselines

Active Directory

Education

BS degree in Computer Science / IT / related engineering

Master's degree (optional)

Tools

SolarWinds

Active Directory

ITIL/ITSM

Job description

Primary Responsibilities

• Systems Analysis & Architecture: Apply advanced systems analysis techniques to consult with DTRA leadership and mission partners, determining complex system functional specifications, capacity requirements, and architectural roadmaps.
• Network & Systems Engineering: Document, test, and modify network and server configurations, security protocols, and directory services (Active Directory) to align with evolving DoD Directives and security baselines.
• Incident & Operational Leadership: Perform shift duties as the 24x7x365 Network Operations and Security Center (NOSC) operations watch officer. Serve as the escalation authority for complex, multi-system outages, leading diagnostic strategy, event correlation, and root-cause analysis.
• Strategic Integration: Provide input for process improvement on operational procedures, incident response frameworks, and SLA-compliant workflow protocols. Evaluate third-party vendor solutions and manage configurations within the ServiceNow ITSM framework.
• Executive Advisory: Interface directly with high-level Mission Partners, DISA, Joint Forces, and Combatant Commands to advise on operational impacts, system vulnerabilities, and technical solutions. Author and present After-Action Reports (AARs) and technical briefings to senior leadership.
• Support Tier I–III system, networking, and engineering personnel to ensure network troubleshooting efforts.
• Oversee real-time monitoring of global enterprise networks using DoD-approved tools (e.g., SolarWinds).
• Develop and enforce operational procedures, incident response workflows, and escalation protocols.
• Interface with Mission Partners, DISA, Joint Forces, and Combatant Commands on network status, issues, and operational impacts.
• Prepare and deliver operational briefs, after-action reports (AARs), and executive summaries to senior leadership.
• Troubleshoot, resolve, and/or elevate technical issues based on ticket assignments, deskside or remotely, as necessary. Correlate events and incidents for management of Information Technology (IT) Services.

Required Qualifications

• Education & Experience: BS degree in Computer Science, Information Technology, or a related engineering field with 8–12 years of experience, or a Master's degree with 6–10 years of experience in enterprise systems engineering, network design, or IT operations management. Specific high-level technical experience may be considered in lieu of a degree.

Technical Expertise

• Advanced, theoretical, and practical understanding of network protocols (TCP/IP, DNS, DHCP, VPNs, firewalls), system virtualization, and enterprise storage networks.

Tools & Frameworks

• Proficiency in administering enterprise monitoring suites (e.g., SolarWinds), Active Directory architecture, and IT Service Management (ITIL/ITSM) frameworks.

Security Certification

• Must possess a current DoD 8570.01-M IAT Level II certification (e.g., Security+ CE) or higher prior to start.

Clearance

• Active Top Secret/SCI security clearance at time of consideration.

Work Schedule

• Day Shift 0600-1800 (Sun-Wed) OR Night Shift 1800-0600 (Wed-Sat)

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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 $17.2 billion for the fiscal year ended January 2, 2026. 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.
• Pay Range $92,300.00 - $166,850.00
• 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.

More details are available here.

Securing Your Data

Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to [e-mail].

Commitment and Diversity

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.

Original Posting and Timeline

Original Posting: September 29, 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.