Senior Network Engineer

Leidos is seeking a Senior Network Engineer to support Federal Civil customer in the Washington, DC metropolitan area., The Senior Network Engineer will serve as a senior technical contributor responsible for designing, implementing, optimizing, and sustaining complex network solutions spanning on-premises infrastructure and hybrid cloud environments. The position requires technical expertise, independent problem-solving, and the ability to develop effective solutions to complex network challenges involving multiple technologies and technical disciplines. The successful candidate will collaborate with customer stakeholders, engineering teams, cybersecurity professionals, and program leadership to maintain network availability, performance, and security while supporting infrastructure modernization and evolving mission requirements. This role also provides technical guidance to other engineers and contributes to network architecture, engineering standards, and continuous operational improvement., * Serve as a Senior technical and escalation resource for complex network engineering and operational issues affecting mission-critical enterprise infrastructure.

• Lead the planning, design, implementation, and optimization of complex network infrastructure solutions across geographically distributed, multi-vendor environments.
• Independently analyze complex technical challenges involving multiple systems and disciplines, develop engineering solutions, and implement corrective actions that improve network reliability, performance, and security.
• Design, configure, maintain, and troubleshoot enterprise routing and switching infrastructure, including BGP, OSPF, VLANs, VRFs, routing redundancy, and network failover.
• Engineer and support enterprise network security solutions, including Cisco Firepower, Firepower Management Center (FMC), ASA, firewall policies, access controls, and security hardening.
• Design, implement, and sustain secure site-to-site and remote-access VPN solutions, including Cisco Secure Client/AnyConnect and connectivity with external partners and vendors.
• Engineer and maintain hybrid cloud network connectivity integrating on-premises infrastructure with AWS networking services, including VPCs, Direct Connect, Transit Gateway, and load balancing.
• Support enterprise wireless networking and network access control technologies, including Cisco Identity Services Engine (ISE).
• Lead technical planning and execution of network infrastructure upgrades, modernization initiatives, lifecycle replacements, and security remediation activities.
• Evaluate network performance, availability, capacity, and emerging technical requirements; recommend and implement improvements to strengthen service delivery and operational resilience.
• Lead complex incident investigations and root cause analysis, identifying systemic issues and developing sustainable corrective and preventive solutions.
• Collaborate with customer representatives, program leadership, cybersecurity teams, vendors, and service providers to assess requirements, develop technical solutions, and influence network engineering decisions.
• Develop and maintain network architecture documentation, configuration standards, technical implementation plans, and operational procedures.
• Support incident, problem, change, and service request management processes while ensuring technical accuracy, documentation, and operational accountability.
• Provide technical mentorship, peer review, and engineering guidance to junior and mid-level network engineers.
• Identify opportunities for network automation, standardization, and process improvement to increase operational efficiency, reliability, and security.

• Must have or able to obtain a Public Trust clearance; Must be a US Citizen., * Bachelor’s degree in Information Technology, Computer Science, Engineering, or a related technical field with 8+ years of relevant network engineering experience; additional education and experience equivalencies may be considered.
• Advanced hands-on experience designing, implementing, administering, and troubleshooting complex enterprise network infrastructure in production environments.
• Expert-level knowledge of enterprise routing and switching technologies, including BGP, OSPF, VLANs, VRFs, and network redundancy and failover.
• Demonstrated experience developing and implementing technical solutions to complex network problems involving multiple systems, technologies, or engineering disciplines.
• Hands-on experience configuring, maintaining, and troubleshooting enterprise network security infrastructure, including firewalls, access control policies, and VPN connectivity.
• Experience supporting Cisco and/or Juniper enterprise networking platforms in complex, multi-vendor environments.
• Experience designing, implementing, or supporting hybrid cloud network connectivity between on-premises infrastructure and AWS environments.
• Demonstrated experience independently leading complex network troubleshooting, root cause analysis, and corrective action efforts.
• Experience planning and executing network infrastructure changes, upgrades, and security remediation activities in production environments.
• Demonstrated ability to develop technical recommendations, communicate complex technical information, and collaborate with customer stakeholders, engineering teams, vendors, and service providers.
• Experience producing and maintaining network diagrams, technical documentation, configuration standards, and implementation procedures.
• Strong communication skills, with experience collaborating directly with customers, vendors, and ISPs to support network design, troubleshooting, and issue resolution.
• Hands-on experience with Juniper EX/QFX & Junos OS, Cisco ISR & IOS devices, ASA, Firepower & FMC.
• Demonstrated experience with routing/switching protocols (e.g., BGP, `OSPF, VRF) and core infrastructure services.
• Hands-on experience managing AWS network infrastructure and hybrid cloud connectivity (e.g., VPC, direct-connect, transit gateways, load balancers) between on-prem and cloud environments.
• Experience with remote access VPN solutions, including Cisco AnyConnect/Secure Client configuration and support.
• Experience with virtual computing/virtualization platforms (e.g., VMware/vSphere) as they relate to network design and connectivity.
• Experience with wireless infrastructure and NAC solutions (e.g., Cisco ISE).

• Experience with Cisco CUCM/UC voice solutions. *

• Able to obtain a baseline 8140 certification [(IAT Level II) CCNA-Security, CySA+, GICSP, GSEC, Security+ CE, CND, SSCP] within 90 days.

PREFERRED QUALIFICATIONS:

• Cisco Certified CCNA

• Cisco Certified CCNP or Juniper JNCIP-ENT.
• Experience with Cisco Meraki wireless solutions.
• Experience with Cisco ISE.
• Experience with Dell switches and OS10.
• Experience with ServiceNow.
• Security+ CE certification.

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:October 15, 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 $92,300.00 - $166,850.00

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., 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.

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.