Red Team Network Engineer IV with Security Clearance

Overview Millennium is proud to be part of the Markon enterprise, a network of specialized organizations united in support of critical national security missions. This partnership strengthens our ability to deliver results by expanding our technical depth, operational reach, and access to a broader bench of proven experts, ensuring our customers continue to receive best-in-class cybersecurity support. Since 2004, Millennium has operated at the forefront of cybersecurity.

Our elite team of over 300 professionals brings an unmatched record of performance across Red Team Operations, Defensive Cyber Operations, Software Engineering, and Technical Engineering. As home to the largest contingent of contracted Red Team operators supporting the Department of Defense, Millennium delivers unparalleled threat intelligence and battle-tested expertise to both DoD and federal civilian customers.

What We Believe Millennium is an equal opportunity employer and does not discriminate or allow discrimination on the basis of race, color, religion, gender, age, national origin, citizenship, disability, veteran status or any other classification protected by federal, state, or local law. Responsibilities Millennium Corporation is hiring a Red Team Network Engineer IV to work in Baltimore, MD. ALL candidates MUST have an active secret clearance with TS/SCI eligibility to qualify for consideration.

Responsibilities

• Design, implement, and sustain a secure, scalable cyber range network supporting Red Team operations, adversary emulation, penetration testing, malware analysis, cyber research, and operator training.
• Architect and deploy isolated Layer 2/Layer 3 network infrastructure, including routing, switching, VLANs, segmentation, IP addressing, and high-performance network services.
• Install, configure, and integrate enterprise networking, compute, virtualization, and storage platforms into a mission-ready cyber range environment.
• Implement secure network segmentation, firewalls, access controls, and management boundaries to protect operational environments and ensure isolation from external networks.
• Configure and optimize virtualized infrastructure, storage connectivity, and shared services to support resource-intensive cyber operations and concurrent training environments.
• Perform infrastructure integration, validation, troubleshooting, and performance optimization to ensure high availability, resiliency, interoperability, and operational readiness.
• Develop and maintain comprehensive network diagrams, architecture documentation, configuration baselines, installation procedures, and operational support documentation.
• Conduct infrastructure testing and acceptance activities, verifying compliance with technical, security, and government requirements while resolving identified deficiencies.
• Collaborate with system administrators, cybersecurity engineers, software developers, cyber operators, and government stakeholders to enhance cyber range capabilities and support mission objectives.
• Provide technical leadership by recommending infrastructure improvements, supporting future expansion and capacity planning, mentoring junior engineers, and ensuring delivery of a maintainable, mission-ready cyber range. Qualifications
• ALL candidates MUST have an active secret clearance with TS/SCI eligibility to qualify for consideration.
• Bachelor's degree in Computer Science, Information Technology, Engineering, or related discipline (or equivalent experience).
• 8+ years designing enterprise network infrastructure.
• Experience designing isolated laboratory or cyber range environments.
• Strong Layer 2/Layer 3 networking experience.
• Experience with Cisco enterprise switching.
• Experience implementing VLANs, STP, LACP, routing, and ACLs.
• Experience configuring enterprise firewalls.
• Experience deploying fiber infrastructure.
• Experience integrating enterprise storage.
• Experience with virtualization networking.
• Experience producing technical documentation.

Desired -

• Experience with VMware, Proxmox, Hyper-V, or KVM.
• Experience with pfSense or OPNsense.
• Experience with Active Directory, DNS, DHCP, Windows Server, and Linux.
• Experience with Docker, Kubernetes, Ansible, Terraform, Git, Python, or PowerShell.
• Experience with DISA STIGs, RMF, and NIST 800-53.
• Experience supporting Red Team infrastructure, adversary emulation, malware analysis, or MITRE ATT&CK. Business Development Assist with Business Development activities as required to support Millennium's strategic business objectives, which may include but not limited to participation in technical interviews, creation of technical documentation, general proposal writing support and proposal color reviews. Physical Requirements
• Must be comfortable with prolonged periods of sitting at a desk and working on a computer.
• Must be able to lift up to 10-15 pounds at a time.

COMPENSATION: $150k-$170k The salary range provided for this position is intended as a general guideline and does not guarantee a specific salary or compensation amount. Final compensation will be determined based on a variety of factors, including, relevant education, experience, knowledge, skills, and abilities.