ManTech seeks a motivated, career and customer-oriented **Lead** **System** **Engineer** to join our team. This is a **remote** opportunity to work from anywhere in the continental US. **Responsibilities include, but are not limited to:** + Perform multi-level troubleshooting and root-cause problem solving, apply Transmission Control Protocol/Internet Protocol (TCP/IP) routing and switching principles to practical solutions. + Ability to configure, maintain, and upgrade LAN/WAN design and topology. + Install/configure LAN/WAN hardware and maintain wiring closets and nomenclature. + Manage Cisco and other hardware, including consumer-grade routers and switches. + Monitor with standard network management and packet analysis tools. + Plan, implement, and administer perimeter security and firewalling. + Evaluate new technologies and make design recommendations for a more efficient and cost-effective network infrastructure. **Minimum Qualifications:** + Bachelor’s degree in computer science or a related field and five or more years of related experience or a combination of education and work experience. + Two to five years of experience with firewall configuration and load balancing + Cisco Certified Internetwork Expert (CCIE) Enterprise Infrastructure. + Understand network protocols including TCP/IP, User Datagram Protocol (UDP) and other common protocols. + Expert knowledge of Border Gateway Protocol (BGP)/Enhanced Interior Gateway Routing Protocol (EIGRP) routing protocol. + Understand all aspects of Virtual Private Network (VPN) design and configurations. + Have expert knowledge of TCP/IP and troubleshooting connectivity issues. + Must have performed in an Agile organization using Scrum, Extreme Programming (XP), Kanban, and SAFe. **Security Clearance Requirements:** + Must have a current/active Top Secret clearance. **Physical Requirements:** + Must be able to remain in a stationary position more than 50% of the time. + Constantly operates a computer. + 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.