{"schemaVersion":"jobsearcher.job.v1","id":"aa483049e1b5b6e10b84813b","url":"https://jobsearcher.com/jobs/aa483049e1b5b6e10b84813b","canonicalUrl":"https://jobsearcher.com/jobs/aa483049e1b5b6e10b84813b","title":"Network Security Engineer","description":"MANTECH seeks a motivated, career and customer-oriented Network Security Engineer to join our team in Chantilly, VA. This is an onsite position.\n\nResponsibilities include but are not limited to:\n\nPerform Tier II and Tier III network security engineering support, while assisting in designing advanced WAN, LAN, and data center solutions.\n\nMonitor and configure networks utilizing SolarWinds, Cisco Firepower FMC, and Cisco ISE to analyze complex network requirements and ensure complete, functioning infrastructure\n\nCreate, maintain, and interpret highly detailed technical network security diagrams, routing topology schemas, and robust hardware configuration baselines\n\nCoordinate across large internal teams, stakeholders, and Sponsor authorities to drive infrastructure agendas and successfully navigate systems engineering processes\n\nParticipate in all phases of the ITIL Service Lifecycle, including submitting Change Requests and maintaining security event monitoring policies\n\nEvaluate current network security architectures, inventory complex routing pathways, and recommend process improvements to optimize performance and throughput\n\nDeliver end-to-end functional analysis, requirements specification, cost estimation, and engineering package releases for customer production IT environments\n\nMinimum Qualifications:\n\nHigh School Diploma or GED with 7+ years of progressively responsible experience in Network Security Engineering, Network Analysis, or a related technical discipline\n\nCisco Certified Network Associate (CCNA) certification, or equivalent routing/switching technical certification, ex., Juniper Networks Certified Associate – Junos (JNCIA-Junos)\n\nDoD 8570 IAT Level II Certification, e.g., Security+\n\nDoD 8570.1 / DoD 8140.01 (IAT III Level) certification required within 6 months of hire, e.g., SecurityX\n\nPreferred Qualifications:\n\nBachelors degree in an engineering discipline\n\nExperience using and administering SolarWinds alongside deep knowledge of Microsoft Windows Systems, HP SANs, and VMware products\n\nAdvanced experience managing VPNs, GRE tunnels, routing protocols (BGP E/I, OSPF), VLANs, VRFs, and configuring KGs\n\nStrong familiarity with Cisco ACI, data center fabric best practices, Ansible, and Desired State Configuration (DSC)\n\nStrong familiarity with Cisco Secure Firewall ( Firepower FMC)\n\nPractical knowledge of BICSI standards, terminating fiber and Cat 5 cabling, as well as familiarity with NSTISSAM TEMPEST/2-95 and CNSSAM TEMPEST/01-13 guidelines\n\nClearance Requirements:\n\nMust have a current and active TS/SCI clearance\n\nPhysical Requirements:\n\nThe person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations.","company":"ManTech","rawCompany":"mantech","city":"Gaithersburg","state":"MD","isRemote":false,"isActive":false,"createdAt":"2026-08-14T15:17:55.078Z","occupations":[{"code":"15-1241.00","title":"Computer Network Architects","slug":"computer-network-architects"},{"code":"15-1244.00","title":"Network and Computer Systems Administrators","slug":"network-and-computer-systems-administrators"},{"code":"15-1231.00","title":"Computer Network Support Specialists","slug":"computer-network-support-specialists"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"541513","title":"Computer Facilities Management Services","slug":"computer-facilities-management-services"},{"code":"541519","title":"Other Computer Related Services","slug":"other-computer-related-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Network Security Engineer","description":"MANTECH seeks a motivated, career and customer-oriented Network Security Engineer to join our team in Chantilly, VA. This is an onsite position.\n\nResponsibilities include but are not limited to:\n\nPerform Tier II and Tier III network security engineering support, while assisting in designing advanced WAN, LAN, and data center solutions.\n\nMonitor and configure networks utilizing SolarWinds, Cisco Firepower FMC, and Cisco ISE to analyze complex network requirements and ensure complete, functioning infrastructure\n\nCreate, maintain, and interpret highly detailed technical network security diagrams, routing topology schemas, and robust hardware configuration baselines\n\nCoordinate across large internal teams, stakeholders, and Sponsor authorities to drive infrastructure agendas and successfully navigate systems engineering processes\n\nParticipate in all phases of the ITIL Service Lifecycle, including submitting Change Requests and maintaining security event monitoring policies\n\nEvaluate current network security architectures, inventory complex routing pathways, and recommend process improvements to optimize performance and throughput\n\nDeliver end-to-end functional analysis, requirements specification, cost estimation, and engineering package releases for customer production IT environments\n\nMinimum Qualifications:\n\nHigh School Diploma or GED with 7+ years of progressively responsible experience in Network Security Engineering, Network Analysis, or a related technical discipline\n\nCisco Certified Network Associate (CCNA) certification, or equivalent routing/switching technical certification, ex., Juniper Networks Certified Associate – Junos (JNCIA-Junos)\n\nDoD 8570 IAT Level II Certification, e.g., Security+\n\nDoD 8570.1 / DoD 8140.01 (IAT III Level) certification required within 6 months of hire, e.g., SecurityX\n\nPreferred Qualifications:\n\nBachelors degree in an engineering discipline\n\nExperience using and administering SolarWinds alongside deep knowledge of Microsoft Windows Systems, HP SANs, and VMware products\n\nAdvanced experience managing VPNs, GRE tunnels, routing protocols (BGP E/I, OSPF), VLANs, VRFs, and configuring KGs\n\nStrong familiarity with Cisco ACI, data center fabric best practices, Ansible, and Desired State Configuration (DSC)\n\nStrong familiarity with Cisco Secure Firewall ( Firepower FMC)\n\nPractical knowledge of BICSI standards, terminating fiber and Cat 5 cabling, as well as familiarity with NSTISSAM TEMPEST/2-95 and CNSSAM TEMPEST/01-13 guidelines\n\nClearance Requirements:\n\nMust have a current and active TS/SCI clearance\n\nPhysical Requirements:\n\nThe person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations.","datePosted":"2026-08-14T15:17:55.078Z","dateModified":"2026-08-14T15:17:55.078Z","hiringOrganization":{"@type":"Organization","name":"ManTech","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Gaithersburg","addressRegion":"MD","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"aa483049e1b5b6e10b84813b"},"url":"https://jobsearcher.com/jobs/aa483049e1b5b6e10b84813b"}}