Lead Network Administrator

MANTECH • Doral, FL

13h • Onsite

About The Position

MANTECH is seeking a motivated, customer-oriented Lead Network Administrator to join its team in Doral, Florida. The position provides technical leadership for network administration across mission networks, supporting reliable operations and security compliance. The role follows a Panama Schedule: three 12-hour shifts followed by three days off, repeating. Shifts rotate between days and nights every 90 days, and the employee must be willing to work days, nights, weekends, and holidays.

The administrator leads and mentors junior IT staff and help desk technicians, manages enterprise network infrastructure, and administers security policies and access workflows using Cisco ISE. The role also troubleshoots complex network and authentication issues, performs maintenance and vulnerability patching, supports baseline configuration management, collaborates with engineering, cybersecurity, and site leadership teams, and maintains technical documentation and network diagrams.

The position requires a current, active Top Secret security clearance and eligibility to obtain and maintain a TS/SCI clearance. It is an onsite, full-time role.

Requirements

• Bachelor’s degree in Computer Science, Information Technology, Network Engineering, or a related field and at least 7 years of network administration experience; alternatively, a master’s degree and at least 5 years of relevant experience, an associate’s degree and at least 9 years, or a high school diploma and at least 11 years.
• 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 IT documentation and network diagrams.
• Must hold a current, active Top Secret security clearance.
• Must be eligible to obtain and maintain a TS/SCI clearance.
• Must be willing to work days, nights, weekends, and holidays on a rotating Panama Schedule.
• Must be able to remain stationary for 50% of the time and occasionally move around the office to access file cabinets and office machinery.
• Must frequently communicate with co-workers, management, and customers, including potentially delivering presentations, and exchange accurate information.

Nice To Haves

• 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.
• Ability to collaborate effectively across multidisciplinary engineering teams in dynamic operational settings.

Responsibilities

• Provide technical leadership and mentorship to junior IT staff and help desk technicians, establishing best practices for daily operations.
• Manage and administer enterprise routers, switches, firewalls, and network infrastructure components across mission networks.
• Develop, implement, and enforce network security policies, profiling rules, and guest access workflows within Cisco ISE.
• Troubleshoot complex network connectivity issues, authentication failures, and access control policy enforcement points.
• Conduct routine system maintenance, vulnerability patching, firmware updates, and baseline configuration management for network devices.
• Collaborate with cross-functional engineering teams, cybersecurity staff, and site leadership to maintain network uptime and security compliance.
• Maintain technical documentation, network diagrams, baseline configurations, and operational inventories.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior