Red Team Security Engineer IV

Millennium is 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 best-in-class cybersecurity support. For over two decades, Millennium has operated at the forefront of cybersecurity with an elite team of over 300 professionals specializing in 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 DoD and federal civilian customers.

About the role

We are seeking an experienced Red Team Security Engineer IV to join our offensive cybersecurity team supporting high-impact national security missions in Huntsville, AL. This role involves emulating advanced adversaries, developing custom tools, and conducting complex penetration testing in enterprise environments.

Responsibilities

• Conduct Red Team assessments and penetration testing against enterprise networks, applications, and systems.
• Research emerging vulnerabilities, exploitation techniques, and threat vectors.
• Develop custom tools and scripts to support offensive cyber operations.
• Design, configure, and maintain representative testing environments.
• Support cyber exercises, training events, demonstrations, and mission activities.
• Manage multiple penetration testing engagements from planning through reporting.
• Collaborate with technical teams to identify security risks and improve defensive capabilities.
• Assist with Business Development activities, including participation in technical interviews, creation of technical documentation, proposal writing support, and proposal color reviews.

Requirements

• Active Top Secret Clearance with the ability to obtain SCI eligibility.
• Bachelor's degree in Computer Science, Cybersecurity, Engineering, Mathematics, Information Systems, or related technical discipline (experience may be substituted for education).
• 8-10+ years of experience in offensive cybersecurity.
• CEH and CISSP certifications required upon hire.
• Experience in one or more of the following: Red Team Operations, Computer Network Attack (CNA), Computer Network Exploitation (CNE), Computer Network Defense (CND), or Advanced Penetration Testing.
• Experience developing tools and automation using scripting languages such as PowerShell, Python, Bash, Ruby, or Node.js.
• Experience performing web application security assessments.
• Strong understanding of TCP/IP networking and network security.
• Experience with offensive security tools including Kali Linux, Metasploit, Cobalt Strike, Burp Suite/intercepting proxies, and packet analysis tools.
• Ability to rapidly develop solutions in fast-paced operational environments.
• 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.

Preferred Qualifications

• NSA Remote Interactive Operator Apprentice Certificate or DoD Red Team Journeyman (Level II) certification.
• Physical Security training or experience.
• Strong knowledge of emerging threats, exploits, and attacker methodologies.
• Ability to think like an adversary and solve complex technical challenges independently.

Schedule

• 15-30% (or less) travel as required by the program.