Senior Cyber Security Engineer

General Information

• Requisition: R66742
• Locations: USA-VA-Chantilly
• Posting Date: 03/20/2026
• Security Clearance Required: TSSCI 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, weve 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 Senior Cyber Security Engineer to join our team in Chantilly, VA. You will help design, implement, and maintain secure and scalable systems and infrastructure aligned to mission and business needs. Your role ensures performance integrity and protection across enterprise platforms while serving as a senior technical leader.

Responsibilities include but are not limited to:

• Designing and maintaining complex enterprise systems and infrastructure that support strategic business objectives.
• Developing comprehensive system architecture and design documentation while maintaining a robust library of network diagrams.
• Collaborating with engineering and cybersecurity teams to ensure solutions meet security, performance, and scalability standards.
• Managing and configuring network devices and appliances, including Juniper, Cisco, and F5 platforms.
• Administering and troubleshooting Windows, Linux, and vendor appliance-based systems to ensure high availability.
• Planning and executing OS upgrades, patches, migrations, and system lifecycle tasks.
• Developing and maintaining disaster recovery strategies and proactive system monitoring mechanisms.

Minimum Qualifications

• Bachelors degree or 4 years of additional experience in lieu of a degree.
• 5 years of experience with systems and/or cybersecurity engineering.
• Current DoD 8570 certification meeting IAT Level II requirements.
• Knowledge of system architecture, infrastructure design, and/or advanced networking protocols.
• Experience with VMWare environments, including vCenter and/or ESXi deployment and administration.
• Experience in vulnerability management, including scanning, assessment, remediation, and reporting.
• Experience with cloud platforms such as AWS, Azure, and/or Google Cloud.
• Experience with scripting and automation using Python, Bash, and/or PowerShell for Windows and Linux administration.

Preferred Qualifications

• Advanced cloud certification such as AWS Certified Solutions Architect or Azure Solutions Architect Expert.
• Experience leading security architecture reviews and implementing zero-trust architectures.
• Exposure to SIEM platforms and enterprise monitoring solutions.
• Prior support to IC or DoD environments with ATO accreditation processes and ICD 503 requirements.

Clearance Requirements

• An active TSSCI with Polygraph.

Physical Requirements

• Must be able to remain in a stationary position 50%.
• Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.
• Frequently communicates with co-workers, management, and customers, which may involve delivering presentations.
• Must be able to exchange accurate information in these situations.

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.