**ManTech** is seeking a **Subject Matter Expert (SME) Level Network Engineer** with a specialized focus on Network Access Control (NAC), particularly with significant expertise in CISCO network appliances 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 endpoint validation **Duties, Tasks & Responsibilities:** + Subject Matter Expert (SME) Level design, implementation, and management of NAC solutions utilizing CISCO network devices including load balancers, LINUX servers, and CISCO appliances + Perform configuration, maintenance, and troubleshooting of NAC policies and profiles + 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 NAC technologies + Provide technical support and guidance to internal and external teams and clients on NAC and network security related issues + Participate in the evaluation and selection of new NAC technologies and vendors **Basic Qualifications:** + Bachelor's or Master’s Degree in a relevant Information Technology, Computer Science, Systems Engineer field or similar + 16+ years relevant Network Engineering/Information Technology experience + Significant expertise in CISCO network appliances and associated management software + Significant experience/understanding of network security principle + Proactive approach to maintaining and optimizing endpoint validation + Ability to translate customer requirements into enterprise network solutions + SME level experience as a CISCO Network Engineer with a focus on Network Security + Strong proficiency with NAC platforms + In-depth knowledge of network protocols, TCP/IP stack, and OSI model + Significant experience with firewall management software such as Cisco FTD Excellent communication and interpersonal skills + Ability to work independently and collaboratively in a fast-paced environment **Preferred Qualifications:** + Knowledge of NAC management software such as Cisco Identity Service Engine (ISE) is high desired + Industry certifications such as CCNA Security, CCNP Security, REDHAT Certified Architect (RHCA), or similar industry certifications are preferred + Demonstrated experience with Network Access Controls (NAC), CISCO profiling ISEExperience with Linux Operating Systems (OS) and Python scripting + 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 Network Access Control (NAC) platforms **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.