**ManTech** is seeking a talented and experienced **Network Engineer** with a specialized focus on Firewalls, particularly with expertise in CISCO, Palo Alto, and Juniper network devices and associated management software to join our technology-based program supporting a key Government customer in **Herndon, VA** . The ideal candidate will have a deep understanding of network security principles, excellent problem-solving skills, and a proactive approach to maintaining and optimizing firewall infrastructure. **Duties, Tasks & Responsibilities:** + Design, implement, and manage firewall solutions utilizing CISCO, Palo Alto, and Juniper network devices + Perform configuration, maintenance, and troubleshooting of firewall policies and rules + Monitor network traffic for potential security threats and proactively address vulnerabilities + Collaborate with cross-functional teams to ensure network security standards align with business objectives + Stay up-to-date with the latest industry trends and best practices in network security and firewall technologies + Provide technical support and guidance to internal teams and clients on firewall-related issues + Participate in the evaluation and selection of new firewall technologies and vendors **Basic Qualifications:** + Bachelor's or Master’s Degree in a relevant Information Technology, Computer Science, Systems Engineer field or similar + 11+ years relevant Network Engineering/Information Technology experience + Ability to translate customer requirements into enterprise network solutions + Proven experience as a Network Engineer with a focus on firewall technologies + Strong proficiency with CISCO firewall platforms + In-depth knowledge of network protocols, TCP/IP stack, and OSI model + Experience with firewall management software such as Cisco FTD and Palo Alto Panorama + Excellent communication and interpersonal skills + Ability to work independently and collaboratively in a fast-paced environment **Preferred Qualifications:** + Experience with a wide variety of network technologies and solutions architectures is a plus + Broad understanding of technical principles, theories and concepts in the networking field + Knowledge of state-of-the-art systems engineering principles and network design concepts + Cloud Service Provider and hybrid cloud experience (extending on-premise networks to cloud providers such as AWS, Azure, Oracle and Google) + Strong proficiency with Palo Alto and Juniper firewall platforms is a plus + Industry certifications such as CCNA Security, CCNP Security, Palo Alto Networks Certified Network Security Engineer (PCNSE), or similar industry certifications are preferred ​ **Security Clearance Required** + An active TS/SCI with Polygraph. **Physical Requirements:** + Use hands to operate a computer and other office productivity machinery, such as a calculator, copy machine, and computer printer. + Occasionally move about inside the office to access file cabinets, office machinery, etc. + Constantly position self to maintain computers in the lab, including under desks and in server closets. 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.