Red Team Security Engineer II

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.

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.

Millennium Corporation is seeking a skilled Red Team Security Engineer to join our cybersecurity team in Charleston, SC.

This role is ideal for an offensive security professional with experience conducting penetration testing, developing custom tooling, and emulating advanced adversary tactics.

The selected candidate will support complex security assessments across enterprise environments while helping strengthen customer security through realistic attack simulations.

The Red Team Security Engineer will also:

• Conduct penetration testing engagements against enterprise applications, systems, and global customer networks.
• Perform Red Team operations that emulate sophisticated adversary tactics, techniques, and procedures (TTPs).
• Research emerging vulnerabilities, exploitation methods, and threat vectors to improve offensive capabilities.
• Develop and maintain custom tools, scripts, and payloads using languages such as Python, PowerShell, and Bash.
• Design, configure, and maintain representative test environments to support offensive security assessments.
• Manage penetration testing and Red Team engagements from planning through final reporting and remediation recommendations.
• Analyze network traffic, packet captures, and system behavior using protocol analyzers and security assessment tools.