ManTech seeks a motivated, career and customer-oriented **Lead Network Engineer** to join our team in **Herndon, VA.** We are seeking a highly skilled Lead Network Engineer to design, implement, and maintain secure and scalable network infrastructure supporting federal clients. In this role, you will lead network architecture efforts, oversee implementation, and ensure compliance with government security standards across complex environments. This position plays a critical role in enabling high availability in support of the national security mission. **Responsibilities include but are not limited to:** + Design, deploy, and manage secure, scalable network solutions across enterprise and mission-critical environments. + Perform network capacity planning, performance tuning, and optimization. + Ensure network architecture complies with federal security standards for the respective national security customer (e.g., DISA STIGs, FISMA, FedRAMP, NIST 800-53). + Develop and maintain documentation including network diagrams, SOPs, and contingency plans. + Collaborate with cybersecurity, systems engineering, and cloud teams to align on end-to-end architecture, and to support implementation, maintenance and incident response. + Manage vendor relationships, evaluate tools, and implement new technologies as appropriate. + Support ATO/accreditation efforts and participate in security audits and assessments. + Provide escalation support and technical leadership during network incidents and outages. **Minimum Qualifications:** + Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent experience). + 8+ years of experience in network engineering; 3+ years in a technical leadership role. + Strong experience with Cisco, Juniper, or Palo Alto technologies. + Proficiency in routing/switching, VPNs, firewalls, and load balancing in enterprise and secure environments. + Experience supporting federal networks and knowledge of RMF, DISA STIGs, or NIST 800-53. + Familiarity with cloud network integrations (AWS, Azure, Oracle Cloud, etc.). + Strong troubleshooting and documentation skills. + Prior experience supporting the IC. **Preferred Qualifications:** + Certifications: CCNP, CISSP, CEH, JNCIP, or similar. + Experience with SD-WAN, Zero Trust architecture, or hybrid-cloud networking. + Knowledge of federal compliance frameworks (FedRAMP, FISMA, CMMC). **Clearance Requirements:** + Active TS/SCI with Full Scope Polygraph required. **Physical Requirements:** + Must be able to remain in a stationary position 50% of the time. + Needs to occasionally move about inside the office to access file cabinets, officemachinery, etc. + Frequently communicates with co-workers, management, and customers, which mayinvolve delivering presentations. Must be able to exchange accurate information inthese situations. The footer and salary information are auto populated based on req factors and not necessary to adjust. 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.