Lead Network Administrator

Workforce.miami; Florida; On-site; USD 110,000 - 160,000; Full time

Job summary

MANTECH is seeking a Lead Network Administrator to join our team in Doral, FL. The role includes technical leadership, mentoring junior IT staff, and overseeing enterprise routers, switches, firewalls, and network infrastructure across mission networks.

You will implement network security policies using Cisco ISE, manage patching and baseline configurations, and collaborate with engineering and cybersecurity teams to ensure uptime and compliance.

Qualifications

• 7+ years of experience in network administration with relevant degrees.
• Experience configuring Cisco ISE in enterprise environments.
• Strong background in enterprise routing, switching, 802.1X, RADIUS/TACACS+.
• Ability to obtain and maintain TS/SCI clearance.
• DoD STIG compliance familiarity.

Responsibilities

• Provide technical leadership and mentorship to IT staff.
• Manage routers, switches, firewalls across mission networks.
• Develop and enforce network security policies and NAC workflows.
• Troubleshoot complex network issues and authentication failures.
• Maintain documentation and network diagrams.

Skills

Cisco ISE

Routing & Switching

NAC (Network Access Control)

RADIUS/TACACS+ protocols

Network security policy enforcement

Education

Bachelor’s degree in Computer Science, Information Technology, Network Engineering, or related field

Master’s degree in related field

Associate’s degree

High school diploma with 11+ years of experience

Tools

Cisco ISE

DoD STIG tooling

Job description

# Lead Network AdministratorMANTECHFull timeMiami, FLInformation TechnologyPosted 2 days agoExpires Dec 17, 2026## Job DescriptionMANTECH seeks a motivated, career and customer-oriented Lead Network Administrator to join our team in Doral, FL. This role follows a Panama Schedule. A Panama Schedule is three, 12-hour shifts and then three days off, repeating. This position rotates between night shifts and day shifts every 90 days. Individuals must be willing to work days, nights, weekends and holidays. Responsibilities Include But Are Not Limited To • Provide technical leadership and mentorship to junior IT staff and help desk technicians, establishing best practices for daily operations.• Managing and administering enterprise routers, switches, firewalls, and network infrastructure components across mission networks.• Developing, implementing, and enforcing network security policies, profiling rules, and guest access workflows within Cisco ISE.• Troubleshooting complex network connectivity issues, authentication failures, and access control policy enforcement points.• Conducting routine system maintenance, vulnerability patching, firmware updates, and baseline configuration management for network devices.• Collaborating with cross-functional engineering teams, cybersecurity staff, and site leadership to maintain optimal network uptime and security compliance.• Maintaining accurate technical documentation, network diagrams, baseline configurations, and operational inventories. Minimum Qualifications • Bachelor’s degree in Computer Science, Information Technology, Network Engineering, or a related field with 7+ years of experience in network administration.• OR a master’s degree and 5+ or more years of relevant experience• OR an associate’s degree and 9+ or more years of relevant experience• OR a high school diploma and 11+ or more years of relevant experience• Proven experience configuring, administering, and troubleshooting Cisco Identity Services Engine (ISE) in an enterprise environment. Strong background in enterprise routing, switching, 802.1X authentication, RADIUS/TACACS+ protocols, and network access control (NAC).• Hands-on experience with network device configuration, patch management, and baseline configuration controls. Experience creating, maintaining, and communicating complex information technology documentation and network diagrams. Preferred Qualifications • Relevant professional certifications such as Cisco Certified Network Associate (CCNA), Cisco Certified Network Professional (CCNP Security/Enterprise), or Cisco ISE Specialist certification.• Prior experience supporting U.S. Military Command operations or Department of Defense enterprise network environments.• Familiarity with DoD STIG compliance, network vulnerability scanning, and secure baseline auditing procedures.• Demonstrated ability to collaborate effectively across multi-disciplinary engineering teams in dynamic operational settings. Clearance Requirements • Must hold a current/active top secret security clearance.• Must be eligible to obtain and maintain a TS/SCI clearance Physical Requirements • Must be able to remain in a stationary position 50%.• Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.• Frequently communicates with co-workers, management, and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations.