Leidos is seeking a Sr. Network Engineer/Architect with subject matter expertise to support medium to large scale operations supporting the Department of War.
The I3TS program provides enterprise-wide IT support to enable DTRA’s Information Management & Technology Directorate (ITD) to consolidate, modernize, and continuously innovate the delivery of IT services and mission capabilities to DTRA’s internal and external mission partners operating in CONUS and OCONUS locations.
The Network Engineer/Architect SME supports operation and maintenance of current and modernized capabilities for DTRA. This role will be responsible for technical requirement definition, implementations plans, as well as diagnosing and troubleshooting outages, monitoring networks, infrastructure and systems, and proving proactive mitigation strategies.
**This position is on-site at Fort Belvoir, MD with the possibility of limited remote work.
**Anticipated Starting Salary Range: $185,000 to $205,000**
Primary Responsibilities:
Execute Tier 2 & 3 network operations functions to ensure network stability & DoD security guidance compliance.
Conduct real-time monitoring of global enterprise networks using DoD-approved tools (e.g., SolarWinds, Cisco Identity Services Engine, vendor-related GUIs).
Develop and enforce operational procedures, incident response workflows, and escalation protocols.
Act as the senior technical point of contact for major outages, network events, or cybersecurity incidents.
Ensure all network changes follow Configuration Management and DoD Change Advisory Board procedures.
Design and implement secure network solutions to consolidate connectivity services under an enterprise service.
Collect, investigate, and identify network optimization strategies and techniques to meet capacity and performance standards.
Identify legacy service paths (i.e. dataflow, firewall rulesets, and ACLs) and develop strategies and designs for the to-be enterprise service capability to meet requirements while balancing security, sustainability, and maintainability.
Ensure network compliance with DoD Security Technical Implementation Guidance.
Minimum Requirements:
Active Top Secret / SCI clearance
Active DoD IAT Level II (e.g. Security+) certification
Active CCNA certification
Basic Qualifications:
STEM Bachelor’s degree with minimum 10-12 years of applicable Network Engineer experience. (Additional years of experience accepted in lieu of degree)
Must have broad exposure to common IT infrastructure networking in the areas of LAN, WAN, TCP/UDP, Dual stack IPv4/IPv6, IPSec, VPN, and Firewall Micro-segmentation.
Must have experience in working with two or more of the following vendor network technologies: Cisco, Juniper, F5, Aruba, Palo Alto, Dell, and Brocade.
Experience with SD-WAN solutions, with Dell Versa preferred.
Experience working with AAA servers, specifically Cisco ISE, and endpoint posturing.
Familiarity with Type 1 encryptors.
Experience documenting logical or physical designs using drawing tools (e.g. Visio, PowerPoint) to depict systems, subsystems, interfaces, components, and communications of IT applications and infrastructure.
Experienced and comfortable with conducting technical troubleshooting to resolve Tier 2 & 3 network issues.
Experience conducting site surveys or analyzing data obtained from site surveys.
Experience creating or executing a migration plan to move circuits, network traffic, services, applications, or data between environments or to a commercial cloud provider. Alternatively, experience planning or executing a technology refresh or lifecycle refresh of network devices (i.e. collection routers, internal distribution switches, etc.).
Demonstrate experience in designing and implementing medium to large network infrastructure and producing corresponding technical documentation.
Must be able to work as part of a team to troubleshoot and resolve complex network issues.
Excellent written and verbal communication skills. This shall include drafting SOPs and technical documentation as well as communication with senior program and customer leadership.
Work with information assurance teams to ensure compliance to DoD standards to assist with providing accreditation artifacts.
Must be able to present designs and plans to technical leadership personnel and boards for approvals.
Demonstrated experience in system hardening of network infrastructure to include DoD STIG implementation. Demonstrated experience in one or more of the following enterprise network management tools such as SolarWinds, Cisco Catalyst Center, Ansible, Cisco ISE.
Hands on experience with WAN, LAN, Dual Stack IPv4/IPv6, BGP, OSPF, EVPN, SDWAN, telecommunications and circuits.
Demonstrated expertise in design and improvement of complex and geographically enterprise networks.
Experience providing technical leadership to junior, intermediate, and senior Engineers.
Preferred Qualifications:
STEM Master's degree with 10 years of applicable Network Engineering experience.
CCIE-level knowledge base.
Experience with DataCenter Cisco Nexus VXLAN.
Experience working with automation tools, such as Ansible and Python scripting to build an Infrastructure as Code framework.
We’re not looking for perfectly polished resumes or perfect fits. We’re looking for people who break limits, ask hard questions, and don’t wait to be told what’s next. At Leidos, we’re not following the roadmap — we’re redrawing it.
Original Posting:October 19, 2025For 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.
Top Skills
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.
