Principal Cyber Security Engineer

General information

Requisition # R69619 Locations USA-CO-Denver Posting Date 07/30/2026 Security Clearance Required TS/SCI w/ Poly Remote Type Onsite Time Type Full time

Description & Requirements

Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we’ve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now—unleash your potential with MANTECH!

MANTECH seeks a motivated, career and customer-oriented Principal Cyber Security Engineer to join our team in Denver, CO.

You will help protect our national security while working on innovative projects that offer opportunities for advancement. This role supports the design, implementation, and maintenance of complex systems and infrastructure to proactively mitigate cyber threats to customer networks.

Responsibilities include but are not limited to:

• Deploys solutions to proactively mitigate cyber threats to customer networks.
• Collaborate with cross-functional teams to ensure that our systems and infrastructure meet security, scalability, and performance requirements.
• Troubleshoot and resolve complex system issues, including performance and availability problems.
• Makes recommendations to improve overall security posture to senior management.
• Plan and execute system upgrades, patches, and migrations.
• Evaluates potential system security risks and takes appropriate corrective, mitigation, and recovery actions.
• Researches, evaluates, and provides feedback on problematic security trends and patterns in customer support requirements.

Minimum Qualifications:

• Bachelor’s degree, or 4+ additional years of cyber experience in lieu of a degree.
• 7+ years of cyber security experience.
• Experience with IT system and application engineering background with experience in modern Windows, LINUX, network operating systems, databases, and virtual computing.
• Experience with certification testing, Risk Management Framework (RMF), information assurance tools, DoD STIG, and vulnerability assessment.
• Experience with VMWare infrastructure, including vCenter and ESXi configuration and maintenance.
• Knowledge of network devices (routers and switches), TCP/UDP traffic, firewall technologies, IDS technologies, proxy technologies, and antivirus, spam and spyware solutions.
• DoD 8570 certification meeting IAT Level II required.

Preferred Qualifications:

• Experience with one or more scripting languages such as Python, JavaScript, or Perl.
• Familiarity with Elastic to include Logstash and Kibana concepts.
• Knowledge of IDS (intrusion detection solutions) and the implementation of counter-measures or mitigating controls.
• Understanding of the latest security principles, techniques, and protocols.

Clearance Requirements:

• An active TS/SCI with Polygraph is required.

Physical Requirements

• Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine, and computer printer.
• The person in this position frequently communicates with co-workers, management, and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations.

The projected compensation range for this position is $128,800.00-$214,500.00. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories.  In addition, MANTECH invests in its employees beyond just compensation.  MANTECH’s benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections.
MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.