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Infographic showing various Software Engineer job openings at Millennium in the United States as of August 2026, with employment types broken down into 97% Full Time, and 3% Part Time. Highlights an 88% Physical, 3% Hybrid, and 9% Remote job distribution.

Red Team Security Engineer III

Millennium Corporation

Colorado Springs, CO • On-site

$175K - $185K/yr

Full-time

Posted 29 days ago

Job description

Overview

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 hiring a Red Team Security Engineer III to work in Colorado Springs, CO. ALL candidates MUST have an active TS/SCI security clearance to qualify for consideration.

  • The qualified candidate will support a Red Team Aggressor Mission conducting Cyber Threat emulation.
  • Activities include supporting exercises, operational assessments, Test and Evaluation events,and other training events.
  • Provide an intelligence based cyber threat emulation team acting as a cyber oppositional force to evaluate a system, system of systems, or enterprise environment's ability to continue to operate in cyber contested environments.
  • Work with client to create standard operating procedures for Cyber Red Team operations. Actively assist in training of new Red Team operators assigned to client.

Three must haves- 

  • Previous Government Red Team experience
  • Ability to create procedural documentation and standard operating procedures.
  • Passion for Red Team work, and self start ability to solve complex cyber security problems.
Qualifications
  • ALL candidates MUST have an active TS/SCI security clearance to qualify for consideration.
  • BS and 6-8 years of experience or 2 additional years if only AA or 4 additional years if no degree.
  • IAT Level II: Sec +, OSCP, Sec X, RTJC, or other cyber security certificate is desired
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

15-30%

COMPENSATION:

$175K-$185K

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.

Employment Type: OTHER

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