**ManTech** is seeking a motivated, career and customer-oriented **Cyber Security Engineer, Principal** to join our team in **Chantilly, VA** , area. **Responsibilities include, but are not limited to:** + Responsible for the operations and maintenance of deployed Enterprise Cross Domain Solutions + Engineers and deploys capabilities to provide new functionality, improve system performance/availability, and for generating efficiencies in the maintenance of the operational environment + Provides Tier 2/3 maintenance support for deployed Cross Domain Solutions (CDS) interface technologies + Supports Assessment and Authorization activities related to CDS technologies + Identifies potential conflicts with implementation of CDS technologies within the enterprise and develops recommendations to remediate these conflicts + Contributes to the completion of milestones associated with specific projects + Provides solutions to a variety of complex technical problems + Develop plans to safeguard computer files against unauthorized modification, destruction, or disclosure **Minimum Requirements:** + Bachelor's Degree or 4+ years of additional experience in lieu of degree + 7+ years of cyber experience + Experience with Linux operating systems + Knowledge of general operating system security practices, TCP/IP networking, and network security concepts + IAT Level II certification or willing to obtain within 6 months of hire **Demonstrated technical experience:** + Knowledge of CDS technologies on the NCDSMO approved products list + Knowledge with cybersecurity architectural principles such as defense in depth, resilience, and integrated security operations + Knowledge of database and operating system security + Knowledge of defensive cyber operations + Ability to apply security principles to the systems and enterprise system designs **Clearance Requirement:** + Must possess an active TS/SCI w/ Polygraph **Physical Requirements:** + Must be able to remain in a stationary position 75% of the time. + 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 + Must be able to detect information on a computer screen ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at careers@mantech.com and provide your name and contact information.