Principal Cyber Security Engineer

General information

Requisition #

R68186

Locations

USA-VA-Chantilly

Posting Date

06/03/2026

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 Chantilly, VA.

The Principal Cyber Security Engineer will leverage their strong technical background and knowledge to support the Sponsor's system accreditation efforts, to include creating Body of Evidence (BOE) documentation, responding to/implementing/documenting required controls, and completing required tasks/actions.

Responsibilities include but are not limited to:

• Designing, implementing, and maintaining complex systems and infrastructure that support critical business objectives.
• Deploying solutions to proactively mitigate cyber threats to customer networks while collaborating with cross-functional teams to ensure security and performance requirements.
• Troubleshooting and resolving complex system issues and making recommendations to senior management to improve the overall security posture.
• Planning and executing system upgrades, patches, and migrations while developing robust disaster recovery plans and procedures.
• Developing and implementing system monitoring and alerting strategies and mentoring junior team members on emerging technologies and industry trends.
• Assessing the performance of security controls within IT projects and evaluating potential system security risks to take appropriate corrective, mitigation, and recovery actions.
• Researching, evaluating, and providing feedback on problematic security trends and patterns in customer support requirements.

Minimum Qualifications:

• Bachelor's degree or 4+ years of additional IT experience in lieu of degree
• 7+ years of cyber experience
• Experience navigating the Sponsor's accreditation process and ICD 503 requirements, especially as it relates to creating A&A Body of Evidence (BOE) documentation.
• Experience meeting security requirements in the Sponsor's environment or similar environments using RMF, information assurance tools, and DoD STIGs.
• Experience working across a large team to drive a security agenda and working with complex, intertwined systems and data flows in a fast-paced environment.
• Experience inventorying complex networks and with network documentation, including security compliance, configuration management, patching, and centralized authentication.
• Experience creating, maintaining, and communicating complex information technology documentation, particularly network and security documentation.
• Current IAT Level II Certification or the ability to obtain within six months of hire

Preferred Qualifications:

• Certified Information Systems Security Professional (CISSP certification).
• Experience with the Sponsor's primary cyber risk and compliance automation tools and modern Windows, LINUX, and virtual computing environments.
• Knowledge of IDS solutions, implementation of counter-measures, and familiarity with scripting languages like Python, JavaScript, or Perl.
• Familiarity with Elastic (Logstash/Kibana) and experience with VMWare infrastructure, including vCenter and ESXi configuration.

Clearance Requirements:

• An active TS/SCI 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.

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.