Red Team Security Engineer II

Millennium; Charleston (SC); On-site; USD 120,000 - 146,000; Full time

Job summary

Millennium Corporation seeks a skilled Red Team Security Engineer to join our cybersecurity team in Charleston, SC. The role focuses on offensive security, conducting penetration tests, developing tooling, and emulating advanced adversary TTPs across enterprise environments.

The candidate will design test environments, manage engagements from planning to remediation, and collaborate with internal teams to communicate risks and mitigations.

Qualifications

• Active Top Secret Clearance required.
• Bachelor's degree in Cybersecurity, Computer Science, Engineering, Mathematics, or a related technical field.
• 1+ year hands-on penetration testing experience.
• 3+ years in software development, systems engineering, or computer networking.
• Proficiency with Python, PowerShell, and Bash scripting.
• Experience with web app security assessments, TCP/IP networking, packet analysis, and offensive security tools (Kali Linux, Cobalt Strike).
• Understanding of Red Team C2, evolving threats, vulnerabilities, and exploitation techniques.
• Strong analytical, organizational, and communication skills; able to manage engagements end-to-end.

Responsibilities

• Conduct penetration testing engagements against enterprise applications, systems, and global networks.
• Perform Red Team operations emulating sophisticated adversary TTPs.
• Develop and maintain custom tools, scripts, and payloads (Python/PowerShell/Bash).
• Design, configure, and maintain test environments for offensive security assessments.
• Manage penetration testing engagements from planning through reporting and remediation.
• Analyze network traffic, packet captures, and system behavior with security tools.
• Utilize Kali Linux, Cobalt Strike, and other standard frameworks.
• Communicate findings, risks, and mitigations to internal teams.
• Participate in training and conferences to stay current on threats.
• Assist with business development tasks such as technical interviews and proposal support.

Skills

Penetration testing

Python scripting

PowerShell

Bash

Communication

Independent work

Education

Bachelor's degree in Cybersecurity, Computer Science, Engineering, or Mathematics

Tools

Kali Linux

Cobalt Strike

Wireshark

Job description

Overview

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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.