802.1, Best Practices, CompTIA Security+, Customer Relations, Data Analysis, Documentation, Enterprise Protection, Firewalls, Government, Government Intelligence, Hardware Virtualization, IAT - Information Assurance Technical, Identify Issues, Information Technology & Information Systems, Intelligence Agencies, Internet Security, Intrusion Prevention Systems, Linux Operating System, Microsoft Windows Operating System, Network Operations Center, Network Security, Office Equipment, Operations Security (OPSEC), People Management, Performance Analysis, Performance Management, Presentation/Verbal Skills, Problem Solving Skills, ServiceNow, Software Development, Systems Administration/Management, Systems Engineering, TCP/IP (Transmission Control Protocol/Internet Protocol), Team Player, Technical Leadership, Technical Support, Test Plan/Schedule, Testing, Windows Server Update Services (WSUS)
General information
Requisition #
R68808
Locations
USA-VA-Chantilly
Posting Date
06/22/2026
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 Systems Engineer to join our team in Chantilly, VA.
You will help troubleshoot and fix a cyber security testing environment while developing its replacement. By leveraging your strong technical background, you will support the improvement and sustainment of mission-driven IT solutions that enable secure enterprise operations. This role provides the opportunity to cross train in additional IT areas (e.g., networking, cyber security, etc.).
Responsibilities include but are not limited to:
- Troubleshooting and fixing a 1.0 cyber security testing environment, while developing a 2.0 cyber security testing environment
- Improving performance and increasing security of 1.0 and 2.0 environments
- Working with other groups on the same program to troubleshoot issues, apply fixes, improve performance, and increase environment security
- Working with other system engineers, system administrators, and security engineers to develop and maintain robust diagrams for cyber defense capability test environments
- Evaluating and recommending technology upgrades to support performance improvements and alignment with industry best practices
- Monitoring and analyzing performance and faults while proposing solutions for system optimization and collaborating with stakeholders to coordinate technical information
- Helping security engineers resolve issues and document solutions in SNOW
Minimum Qualifications:
- Bachelor's degree or 4+ years of additional work experience in lieu of a degree
- 3+ years of experience in IT, system engineering, and/or system administration
- IAT Level II certification or higher (Security+, etc.) or the ability to obtain certification within 6 months of hire
- Experience creating, maintaining, and communicating complex IT documentation
- Experience developing, administering, and troubleshooting systems that handle government data while ensuring they meet all cyber security requirements
- Experience with technologies supporting large-scale enterprise deployments or data centers and inventorying complex systems and networks
Preferred Qualifications:
- Experience implementing and supporting complex, multi-component software solutions across a large environment
- Experience deploying enterprise security software including firewalls, intrusion prevention systems (IPS), and virtualization platforms
- Knowledge of Windows and Linux systems, WSUS and PDQ, ServiceNow (SNOW), Tenable/Trellix, EXSI servers, TCP/IP networking, 802.1x, and core network security principles
Clearance Requirements:
- An active TS/SCI with polygraph is required for this position
Physical Requirements:
- Must be able to remain in a stationary position 50% of the time
- 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