Network Administrator, Cisco ISE

MANTECH; Miami (FL); On-site; USD 90,000 - 130,000; Full time

Job summary

MANTECH in Doral, FL seeks a Network Administrator to join our team. The role focuses on configuring Cisco ISE for enterprise access control, 802.1X, and posture assessment, and managing routers, switches, and firewalls across mission networks.

The candidate will develop security policies, troubleshoot complex network issues, perform patching and baseline configurations, and collaborate with engineering, cybersecurity, and site leadership to maintain uptime and compliance.

Qualifications

• Bachelor’s degree in CS/IT/Network Engineering or related field with 5+ years in network administration.
• Or a master’s degree with 3+ years of relevant experience.
• Or an associate’s degree with 7+ years; or a high school diploma with 9+ years.
• Proven experience configuring Cisco ISE in an enterprise environment.
• Strong background in enterprise routing, switching, 802.1X authentication, RADIUS/TACACS+ protocols, and NAC.
• Hands-on experience with network device configuration, patch management, and baseline configuration controls.

Responsibilities

• Configure, deploy, and maintain Cisco ISE for enterprise NAC and 802.1X.
• Manage enterprise routers, switches, firewalls, and network infrastructure.
• Develop and enforce network security policies and guest access workflows.
• Troubleshoot network connectivity, authentication, and policy enforcement.
• Perform routine maintenance, patches, firmware updates, and baseline configuration.
• Collaborate with engineering, cybersecurity, and site leadership to ensure uptime.
• Maintain accurate documentation and network diagrams.

Skills

Cisco ISE

Network administration

RADIUS/TACACS+

NAC

Patch management

Documentation

Education

Bachelor's degree in CS/IT/Network Engineering

Master's degree in related field

Associate's degree + 7+ years

High school diploma + 9+ years

Tools

Cisco ISE

Routers & switches

Firewalls

Job description

MANTECH seeks a motivated, career and customer-oriented Network Administrator to join our team in Doral, FL.

Responsibilities Include But Are Not Limited To

• Configuring, deploying, and maintaining Cisco Identity Services Engine (ISE) for enterprise network access control, 802.1X authentication, and posture assessment.
• 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 5+ years of experience in network administration.
  • OR a master’s degree and 3+ or more years of relevant experience
  • OR an associate’s degree and 7+ or more years of relevant experience
  • OR a high school diploma and 9+ 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.

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.