Network Engineer

Mantis Security Corporation; Reston, Northern (VA, KY); Hybrid; USD 110,000 - 140,000; Full time

Job summary

Mantis Security Corporation is seeking a senior Network Engineer to design, implement, and sustain secure enterprise networks across Cisco, Juniper, HP/Aruba, and Palo Alto platforms. The role emphasizes hands-on engineering, modernization, and security compliance for government networks.

You will work across LAN/WAN infrastructures, support routing and security technologies, and collaborate with operations and vendor teams to ensure resilient, compliant network operations.

Qualifications

• Bachelor’s degree in related field or equivalent experience.
• 10 years of network engineering or network operations experience.
• Hands-on experience with Cisco, Juniper, HP/Aruba, and Palo Alto technologies.
• Experience supporting secure enterprise network environments, including routing, transport, and network security technologies.
• Current DoD 8570 IAT II certification required.
• Current CCNA (or equivalent) required.
• Active TS/SCI with ability to obtain and maintain a CI Polygraph.

Responsibilities

• Engineer and sustain LAN/WAN infrastructure across multi-vendor environments.
• Support advanced routing, switching, transport, and security technologies in enterprise operations.
• Troubleshoot network issues, perform fault isolation, support incident response, and maintain reliable network performance.
• Execute network changes, maintenance activities, and approved engineering updates.
• Troubleshoot and resolve complex issues in coordination with operations teams and vendor support.

Skills

Network engineering

Network operations

Security compliance

Education

Bachelor's degree or equivalent

Tools

Cisco

Juniper

HP/Aruba

Palo Alto

Job description

Description

Mantis Security is a leading specialty firm of high caliber talent who specialize in Cyber Operations, Cyber Defense, Information Assurance, Software Development, DevSecOps, Security Engineering, and Cloud Engineering. We enable and protect our nation's most important IT assets and invest in the long-term career development of every employee! We are currently looking for the next Network Engineer to join our team of experts!

Position Overview

Support the engineering, implementation, sustainment, and troubleshooting of secure enterprise and mission networks across Cisco, Juniper, HP/Aruba, and Palo Alto environments. This senior-level role emphasizes hands‑on network engineering, operational sustainment, infrastructure modernization, and security compliance in complex government networks.

Key Responsibilities

Network Engineering & Operations

• Engineer and sustain LAN/WAN infrastructure across multi-vendor environments.
• Support advanced routing, switching, transport, and security technologies in support of enterprise operations.
• Troubleshoot network issues, perform fault isolation, support incident response, and maintain reliable network performance.
• Support traffic analysis, system monitoring, bandwidth optimization, and operational improvements across enterprise environments.
• Work across routing, switching, wireless, and security technologies to support day‑to‑day operations and long‑term stability.

Security & Modernization

• Implement secure network designs aligned with DISA STIGs, ATO requirements, and government security policies.
• Support firewall, segmentation, and boundary protection efforts, including Palo Alto environments.
• Support technology refreshes, upgrades, migrations, and modernization initiatives.
• Develop architecture diagrams, technical documentation, and implementation support materials.
• Evaluate and recommend improvements to enhance network performance, resilience, and standardization.

Network Implementation & Operational Support

• Execute network changes, maintenance activities, and approved engineering updates.
• Perform hands‑on implementation and sustainment support for infrastructure enhancements and technology refreshes.
• Troubleshoot and resolve complex issues in coordination with operations teams and vendor support.
• Support operational readiness and continuity across enterprise and mission network environments.

Requirements

Required Qualifications

• Bachelor’s degree in related field or equivalent experience.
• 10 years of network engineering or network operations experience.
• Hands‑on experience with Cisco, Juniper, HP/Aruba, and Palo Alto technologies.
• Experience supporting secure enterprise network environments, including routing, transport, and network security technologies.
• Current DoD 8570 IAT II certification required.
• Current CCNA (or equivalent) required.
• Active TS/SCI with ability to obtain and maintain a CI Polygraph.

Preferred Qualifications

• CCNP, JNCIS/JNCIP, Palo Alto, Aruba, or similar advanced certifications preferred.
• Experience in DoD or Intelligence Community environments.
• Experience supporting TAC, NOC, transport engineering, or enterprise network operations.