Network Administrator, Cisco ISE

MANTECH; Florida; On-site; USD 90,000 - 120,000; Full time

Job summary

MANTECH in Doral, FL seeks a Network Administrator to support enterprise networking for mission networks. You will configure Cisco ISE, manage routers, switches, and firewalls, and enforce 802.1X authentication and NAC across the environment.

Collaborate with engineering, cybersecurity, and site leadership to maintain uptime, document networks, and ensure security compliance in a DoD-focused setting. A Top Secret clearance is required, with strong documentation and cross-team communication

Qualifications

• Experience configuring, administering, and troubleshooting Cisco ISE in enterprise environments.
• Strong background in enterprise routing, switching, 802.1X authentication, and NAC.
• Proven capability to document networks and create diagrams.

Responsibilities

• Configure, deploy, and maintain Cisco ISE for access control and posture assessment.
• Manage routers, switches, firewalls, and network infrastructure across mission networks.
• Develop and enforce network security policies and guest access workflows.
• Troubleshoot connectivity, authentication failures, and policy enforcement issues.
• Perform routine maintenance, patching, and baseline configuration management.
• Collaborate with engineering, cybersecurity, and site leadership to ensure uptime.
• Maintain accurate network docs, diagrams, and inventories.

Education

Bachelor’s degree in Computer Science / IT / Network Engineering

Master’s degree and 3+ years of experience

Associate’s degree and 7+ years of experience

High school diploma with 9+ years of experience

Tools

Cisco Identity Services Engine (ISE)

RADIUS/TACACS+

NAC (Network Access Control)

Job description

Shape the future of defense with MANTECH! Join a team dedicated to safeguarding our nation through advanced tech and innovative solutions. Since 1968, we’ve been a trusted partner to the Department of Defense, delivering cutting-edge projects that make a real impact. Dive into exciting opportunities in Cybersecurity, IT, Data Analytics and more. Propel your career forward and be part of something extraordinary. Your journey starts now—protect and innovate with MANTECH!

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.

MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at [e-mail] (mailto:[e-mail]) and provide your name and contact information.