Red Team Security Engineer II with Security Clearance

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 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.
• Utilize offensive security platforms and toolsets, including Kali Linux, Cobalt Strike, and other industry-standard frameworks.
• Collaborate with internal teams to communicate findings, technical risks, and mitigation strategies.
• Participate in technical training, industry conferences, and cybersecurity exercises to maintain certifications and remain current on evolving threats. Qualifications
• Active Top Secret Clearance.
• Bachelor’s degree in Cybersecurity, Computer Science, Engineering, Mathematics, or a related technical field.
• Active DoD 8570 IAT Level II certification (Security+ CE, CySA+, CND, CCNA Security, or equivalent).
• One of the following certifications, or the ability to obtain within one year of hire: OSCP, OSWE, CRTO, CPTS, CBBH, PNPT, GRTP, GX-PT, or GXPN.
• 3+ years of experience in software development, systems engineering, or computer networking, including 1+ year of hands-on penetration testing experience.
• Proficiency with Python, PowerShell, and Bash scripting.
• Experience with web application security assessments, TCP/IP networking, packet analysis, and offensive security tools such as Kali Linux and Cobalt Strike.
• Understanding of Red Team command-and-control (C2) infrastructure, emerging threats, vulnerabilities, and exploitation techniques.
• Strong analytical, organizational, and communication skills, with the ability to work independently and manage penetration testing engagements from planning through reporting. 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. Travel Requirements
• Less than 25% COMPENSATION: $120,000-$146,000 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.