Access Control, Best Practices, CCNP - Cisco Certified Network Professional, CISA - Certified Information Systems Auditor, CISM - Certified Information Security Manager, CISSP - Certified Information Systems Security Professional, Change Control, Computer Security, Cross-Functional, Customer Relations, Data Analysis, Data Recovery, DoD Directive 8140, DoD Directive 8570, Documentation, Editing, Environmental Impact, Firewalls, GCIH - GIAC Certified Incident Handler, GSLC - GIAC Security Leadership Certificate, Government Intelligence, IAM - Information Assurance Management, Information Systems Security Engineering (ISSE), Information Technology & Information Systems, Intelligence Agencies, International Classification of Diseases (ICD), Internet Application, Internet Security, Intrusion Detection Systems, Intrusion Prevention Systems, Leadership, Office Equipment, Operational Audit, People Management, Presentation/Verbal Skills, Program Planning, Project/Program Coordination, Proxy Server, Risk Management Framework (RMF), Software Administration, Software Development, Software Patches, Systems Administration/Management, Systems Engineering, Team Player, Technical Writing, Testing, U.S. National Institute of Standards and Technology (NIST), Writing Skills
General information
Requisition #
R67842
Locations
USA-VA-Chantilly
Posting Date
05/19/2026
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 Senior Principal Cyber Systems Engineer to join our team in Chantilly, VA.
The Senior Principal Cyber Systems Engineer will leverage their strong technical background and knowledge to support complex cybersecurity initiatives by delivering hands-on engineering expertise across a wide range of security technologies. You will help protect vital systems and drive cyber defense innovation in a collaborative, high-impact environment.
Responsibilities include but are not limited to:
- Providing engineering support and system administration for specialized cybersecurity applications and systems-including installation, configuration, maintenance, patching, and backup/restoration
- Serving as a subject matter expert in the creation, editing, and management of signatures, rules, filters, and custom content for cybersecurity systems such as IDS, IPS, firewalls, web application firewalls, proxy servers, and SIEMs
- Applying Systems Engineering best practices specific to Cyber Operations and evaluating enterprise-level cyber requirements against approved architectures and roadmaps; making informed recommendations for requirement approval or rejection
- Administering cybersecurity test beds, conducting tests and evaluations of new tools, access controls, configurations, and signatures/rules
- Providing Tier 2 maintenance support for deployed cybersecurity technologies
- Collaborating with cross-functional engineering teams to design and implement secure systems; working knowledge of the Risk Management Framework (RMF) and NIST 800-53 security controls is essential
- Performing the duties of an Information Systems Security Engineer (ISSE) in coordination with the Program's ISSE Team
Minimum Qualifications:
- Bachelor's degree or an additional 4+ years of IT experience in lieu of a degree
- 7+ years of experience in cybersecurity
- Ability to obtain a DoD 8570 certification at IAM-III (CISSP, CISM, GSLC, CCISO) or IAT-III (GCIH, CISSP, CASP+, CCNP Security, CISA, GCED) within 6 months of hire
- Strong technical writing and documentation skills; capable of communicating with diverse stakeholders, from technical teams to senior leadership
- Experience executing the RMF process from system categorization through continuous monitoring
- Familiarity with Systems Security Engineering (SSE) documentation including Cybersecurity Strategies, Information Support Plans, and Program Protection Plans (PPPs)
Preferred Qualifications:
- Experience with ICD 503 and associated Assessment and Accreditation processes and tools
- Familiarity with supplemental security control frameworks such as JSIG and/or ICD 503
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
- 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.
M
ManTech International Corp
Our Mission
Our mission is empowering our nation through a diverse and skilled workforce securely delivering innovative technology, consulting services and digital solutions for our customers’ mission success, every day.
Our Vision
Our vision is Securing the Future as the most trusted partner for U.S. Defense, Intelligence and Federal Civilian customers through the power of One ManTech. When these agencies think of an essential partner for their national and homeland security needs, they think ManTech.
Our Values
Our values are grounded in a bedrock of truth, integrity and caring for each other and the mission. We hold steadfast to:
• TRUST – We earn and protect the trust of our customers, employees and investors through an enduring foundation of respect, fairness, credibility and honoring our commitments, always.
• INCLUSION – We are an inclusive, diverse and talented workforce with a passion for mission success, intellectual capital, creativity and integrity. Our high ethical standards and investment in our people build confidence with our customers.
• QUALITY– We deliver exceptional quality to customers through differentiated technology solutions and an uncompromising focus on excellence, value and innovation.
5,000 to 9,999 employees
https://www.mantech.com/about