**ManTech** seeks a motivated, career and customer-oriented **Principal Cyber Network Engineer** to join our team in **Chantilly, VA.** **Responsibilities include but are not limited to:** + Provides insight into efficiencies that can be gained from the current workflow based on an understanding of the customers’ requirements + Work with engineers on troubleshooting and building complex, highly available network topologies + Performs engineering support and system administration of applications and systems to include installation, configuration, maintenance, patching, and back-up/restore + Provides Tier 2/3 maintenance and engineering support for deployed technologies + Supports Assessment and Authorization activities related to cybersecurity technologies, where applicable + Identifies potential conflicts with implementation of any cybersecurity tools within the enterprise and develops recommendations to remediate these conflicts + Provides ideas for automating repetitive project tasks and metrics collection using scripts and assists with testing/implementation to production **Minimum Qualifications:** + Bachelor's degree or 4 additional years of network experience in lieu of degree + 7+ years of related network experience (firewalls, routers, switches, and load balancers) + Experience with deploying, upgrading, and troubleshooting multivendor network equipment and solutions, including Juniper, F5, and Nutanix + Knowledge of Windows and Linux systems, general operating system security practices, TCP/IP networking, and network security concepts is required + Knowledge of LANs, firewalls, routers and switches + Must have or be willing to obtain IAT Level II or higher certification within 6 months of hire **Preferred Qualifications:** + Knowledge of federal Cyber Security Guidance such as NIST SP 800-37 – Guide for Applying the Risk Management Framework (RMF) to Federal Information Systems and NIST 800-137 – Information Security Continuous Monitoring (ISCM) for Federal Information Systems and Organizations **Clearance Requirements:** + Must have a current/active TS/SCI w/Polygraph **Physical Requirements:** + The person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations. 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.