ManTech seeks a motivated, career and customer-oriented **Lead IT Systems Engineer** to join our team in **Chantilly, VA.** **Responsibilities include but are not limited to:** + Providing server/operating system centric expertise for testing, deploying, integrating, and improving upon new and existing IT capabilities. + Understanding and providing recommendations related to understanding operating system dependencies, physical and virtual server environments, integration with infrastructure resources (e.g. storage and networking), and how to configure operating systems and applications in an efficient manner. + Maintaining platforms of common hypervisors and enterprise applications, including collaboration tools, Systems Information and Event Monitoring (SIEM) products, directory services, and automation technologies. + Identifying and mitigating security vulnerabilities, testing and documenting security-relevant changes, and communicating with vendors to assess new technologies. **Minimum Qualifications:** + Bachelor’s degree in Computer Science, Systems Engineering, or other IT-related discipline and seven (7) years of relevant experience in information technology, leveraging software applications and tools to meet customer requirements. + Current DoD 8570 IAT II certification (Security +, SSCP, or equivalent) or ability to obtain one within 180 days. + Experience writing clear, concise, and user-friendly technical and training manuals or similar documentation to include documents required for A&A IAW ICD 503. + Experience in Local Area Network/Wide Area Network technologies, routers, switches, firewalls; experience with Storage Area Network (SAN), clustering and backup technologies. + Ability to perform Tier 3 operational maintenance on audit systems to include: system engineering, system administration, database management, backup administration, change configuration and management, policy creation, and certification and accreditation procedures. **Clearance Requirements:** + Must have a current/active TS/SCI w/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 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.