Lead Network Administrator — ISE & Security Specialist

ManTech; Florida; On-site; USD 110,000 - 150,000; Full time

Job summary

ManTech seeks a motivated Lead Network Administrator to join our team in Doral, FL on a Panama Schedule with rotating day/night shifts. You will lead network operations, mentor staff, and ensure security and uptime across mission networks.

Responsibilities include configuring Cisco network devices, managing Cisco ISE, enforcing NAC policies, and maintaining documentation. Top secret clearance required, TS/SCI eligibility preferred. Excellent communication and teamwork a must.

Qualifications

• Bachelor’s degree in Computer Science, Information Technology, Network Engineering, or a related field.
• Master’s degree and 5+ years of relevant experience
• Associate’s degree and 9+ years of relevant experience
• High school diploma and 11+ years of relevant experience
• Proven experience configuring, administering, and troubleshooting Cisco Identity Services Engine (ISE) in an enterprise environment.
• Hands-on experience with network device configuration, patch management, and baseline configuration controls.

Responsibilities

• 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.

Skills

Cisco ISE

Enterprise routing & switching

Network security policies

Documentation & diagrams

Education

Bachelor’s degree in Computer Science / IT / Network Engineering or related field

Master’s degree with 5+ years of relevant experience

Associate’s degree with 9+ years of relevant experience

High school diploma with 11+ years of relevant experience

Tools

Cisco ISE

RADIUS/TACACS+ protocols

Job description

ManTech seeks a motivated Lead Network Administrator to join our team in Doral, FL on a Panama Schedule with rotating day/night shifts. You will lead network operations, mentor staff, and ensure security and uptime across mission networks.

Responsibilities include configuring Cisco network devices, managing Cisco ISE, enforcing NAC policies, and maintaining documentation. Top secret clearance required, TS/SCI eligibility preferred. Excellent communication and teamwork a must.