Network Security Engineer

MANTECH; Virginia; On-site; USD 110,000 - 160,000; Full time

Job summary

MANTECH seeks a motivated Network Security Engineer to join our team in Chantilly, VA. This is an onsite position requiring TS/SCI clearance and a customer-focused mindset to support DoD networks.

The role involves Tier II/III security engineering, WAN/LAN/data center design support, and hands-on configuration using SolarWinds, Cisco Firepower FMC, and Cisco ISE. Collaboration with large teams and stakeholders is essential to drive secure infrastructure.

Qualifications

• 7+ years of experience in Network Security Engineering or related field.
• CCNA or equivalent certification required.
• DoD 8570IAT Level II and DoD 8570.1/DoD 8140.01 Level III certifications required within 6 months of hire.

Responsibilities

• Perform Tier II and Tier III network security engineering support.
• Assist in designing WAN, LAN, and data center solutions.
• Monitor and configure networks with SolarWinds, Firepower FMC, and ISE.
• Create and interpret detailed network security diagrams and baselines.
• Coordinate with large internal teams and Sponsor authorities.
• Participate in ITIL Service Lifecycle activities, including Change Requests.
• Deliver end-to-end analysis, requirements, cost estimation, and engineering package releases for customer environments.

Skills

Team coordination

ITIL processes

Security mindset

Education

High School Diploma or GED (7+ years exp)

CCNA or equivalent routing/switching cert

DoD 8570IAT II (Security+)

DoD 8570.1/8140.01 IAT III

Tools

SolarWinds

Cisco Firepower FMC

Cisco ISE

VMware

Windows systems

Job description

MANTECH seeks a motivated, career and customer-oriented Network Security Engineer to join our team in Chantilly, VA. This is an onsite position.

Responsibilities include but are not limited to:

• Perform Tier II and Tier III network security engineering support, while assisting in designing advanced WAN, LAN, and data center solutions.

• Monitor and configure networks utilizing SolarWinds, Cisco Firepower FMC, and Cisco ISE to analyze complex network requirements and ensure complete, functioning infrastructure

• Create, maintain, and interpret highly detailed technical network security diagrams, routing topology schemas, and robust hardware configuration baselines

• Coordinate across large internal teams, stakeholders, and Sponsor authorities to drive infrastructure agendas and successfully navigate systems engineering processes

• Participate in all phases of the ITIL Service Lifecycle, including submitting Change Requests and maintaining security event monitoring policies

• Evaluate current network security architectures, inventory complex routing pathways, and recommend process improvements to optimize performance and throughput

• Deliver end-to-end functional analysis, requirements specification, cost estimation, and engineering package releases for customer production IT environments

Minimum Qualifications:

• High School Diploma or GED with 7+ years of progressively responsible experience in Network Security Engineering, Network Analysis, or a related technical discipline

• Cisco Certified Network Associate (CCNA) certification, or equivalent routing/switching technical certification, ex., Juniper Networks Certified Associate - Junos (JNCIA-Junos)

• DoD 8570IAT Level II Certification, e.g., Security+

• DoD 8570.1 / DoD 8140.01 (IAT III Level) certification required within 6 months of hire, e.g., SecurityX

Preferred Qualifications:

• Bachelors degree in an engineering discipline

• Experience using and administering SolarWinds alongside deep knowledge of Microsoft Windows Systems, HP SANs, and VMware products

• Advanced experience managing VPNs, GRE tunnels, routing protocols (BGP E/I, OSPF), VLANs, VRFs, and configuring KGs

• Strong familiarity with Cisco ACI, data center fabric best practices, Ansible, and Desired State Configuration (DSC)

• Strong familiarity with Cisco Secure Firewall ( Firepower FMC)

• Practical 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

Clearance Requirements:

• Must have a current and active TS/SCI clearance

Physical Requirements:

• The 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.