Principal Cyber Engineer

Salary: $100,000 - 140,000 per year Requirements: We require a bachelors degree, or 4+ additional years of IT experience in place of a degree. We require 7+ years of experience in cybersecurity or network engineering. We need hands-on proficiency with routing protocols such as BGP and OSPF. We require direct experience with network virtualization and encapsulation technologies, including EVPN-VXLAN and MPLS. We need a strong grasp of traffic management and perimeter security tools such as load balancers, firewalls, and virtualized infrastructure. We require experience troubleshooting web application traffic, including a deep understanding of HTTPS transactions and mutual TLS (mTLS). We need a solid understanding of Windows and Linux systems, operating system security practices, and network security concepts. We require experience deploying, upgrading, and troubleshooting multi-vendor network platforms and solutions, including Juniper, Palo Alto, F5, and Nutanix. We need experience using SNMP-based monitoring tools. We require the ability to obtain an IAT Level II certification or higher within 6 months of hire. We require an active TS/SCI clearance with Polygraph. Preferred: knowledge of Cross Domain Solutions (CDS) technologies on the NCDSMO approved products list. Preferred: understanding of defense-in-depth, resilience, and integrated security operations principles. Preferred: familiarity with federal cybersecurity guidance such as NIST SP 800-37 and NIST SP 800-137. Preferred: practical experience with LANs, firewalls, routers, and switches. Preferred: experience working in Agile environments. Physical requirement: we require the ability to remain stationary for 50% of the time and occasionally move around the office as needed. Responsibilities: We partner with engineers, cross-functional teams, and customers at multiple levels to gather, coordinate, and deliver technical information. We work closely with engineering teams to troubleshoot and build complex, highly available network topologies. We develop and manage monitoring and alerting strategies using SNMP, flow analytics, packet inspection, and infrastructure telemetry to identify performance issues, capacity limits, and service disruptions early. We lead advanced network troubleshooting and root cause analysis across enterprise, data center, cloud, and hybrid environments using packet captures, routing analysis, traffic flow inspection, and protocol-level diagnostics. We provide engineering support and system administration for applications and systems, including installation, configuration, maintenance, patching, and backup and restore activities. We deliver Tier 2/3 maintenance and engineering support for deployed network and cybersecurity technologies. We support Assessment and Authorization (A&A) activities tied to cybersecurity technologies, where applicable. We create automation solutions for repetitive project work and metrics collection using scripting, with support for testing and production rollout. We carry out additional project and corporate duties as assigned to help meet customer mission needs. Technologies: Cloud Flow Support Linux MPLS Network Nutanix Security Web Windows DevOps More: We are MANTECH and we are seeking a motivated, mission-focused Principal Cyber Engineer with a network focus to join our team in Chantilly, VA. In this role, we provide advanced engineering expertise to design, implement, secure, and sustain complex enterprise network environments that support critical customer missions. We collaborate across technical teams and with customer stakeholders to deliver resilient, highly available, and secure network solutions while driving operational excellence and innovation. last updated 34 week of 2026