Red Team Security Engineer II

About the role

Millennium 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.

Responsibilities

• Support complex security assessments across enterprise environments while helping strengthen customer security through realistic attack simulations.
• 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.

Requirements

• Active Top Secret Clearance.
• 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.

Qualifications

• Bachelor’s degree in Cybersecurity, Computer Science, Engineering, Mathematics, or a related technical field.

Skills

• Python
• PowerShell
• Bash scripting
• Web application security assessments
• TCP/IP networking
• Packet analysis
• Kali Linux
• Cobalt Strike
• Red Team command-and-control (C2) infrastructure
• Emerging threats, vulnerabilities, and exploitation techniques

Benefits

• Equal opportunity employer

Pay

Less than $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.

Schedule

Full-time