Operation Technology (OT) Network Administrator

Proksi Systems; Yona Municipality (GU); On-site; USD 110,000 - 170,000; Full time

Job summary

Proksi Systems is seeking an experienced Operational Technology (OT) Network Administrator to support NAVFAC Marianas on Naval Base Guam (Onsite). This role requires active Top Secret security clearance and hands-on management of FRCS/ICS/BMS/SCADA networks.

You will configure industrial networking gear, enforce secure IT/OT segmentation, and collaborate with cybersecurity personnel and vendors to keep Navy facilities secure and reliable.

Qualifications

• Active Top Secret (Tier 5) clearance or Interim T5 eligibility.
• U.S. Citizenship required.
• Minimum 5 years of advanced network administration experience.
• Minimum 3 years supporting OT/ICS/SCADA/BMS/FRCS.
• Experience with BACnet/IP, Modbus TCP, DNP3 or similar.
• Experience implementing network segmentation and OT cybersecurity best practices.
• Working knowledge of RMF, STIGs, NIST SP 800-82, and DoD cybersecurity requirements.
• Excellent troubleshooting, analytical, communication, and documentation skills.

Responsibilities

• Administer and maintain OT/ICS/BMS networks.
• Configure Cisco Ethernet, Palo Alto firewalls, Data Diodes, Stratix and other industrial networking gear.
• Implement secure IT/OT segmentation using the Purdue Model.
• Manage firewall policies, ports, protocols, and OT boundary protection.
• Troubleshoot OT network outages and protocol communications (Tier III).
• Analyze network traffic with Wireshark and similar tools.
• Support RMF activities, vulnerability remediation, and STIG implementation.

Skills

OT network security

Network troubleshooting

Documentation

Communication

RMF/STIG/NIST knowledge

Tools

Cisco Industrial Ethernet

Palo Alto firewalls

Data Diodes

Stratix

RuggedCom

Job description

Operational Technology (OT) Network Administrator (Top Secret)

Location: Naval Base Guam (Onsite)

Clearance: Active Top Secret (Tier 5) or eligible for Interim T5

Employment Type: Full-Time

Position Overview

Proksi Systems is seeking an experienced Operational Technology (OT) Network Administrator to support the Naval Facilities Engineering Systems Command (NAVFAC) Marianas. This position supports mission-critical Facility-Related Control Systems (FRCS), Industrial Control Systems (ICS), Building Management Systems (BMS), and SCADA environments responsible for maintaining Navy infrastructure and facilities.

Responsibilities

• Administer and maintain industrial Ethernet networks supporting OT/ICS/BMS environments.
• Configure and support Cisco Industrial Ethernet, Palo Alto firewalls, Data Diodes, Stratix, RuggedCom, and other industrial networking equipment.
• Implement and maintain secure IT/OT network segmentation utilizing the Purdue Model.
• Manage firewall policies, Ports, Protocols, and Services Management (PPSM), and OT boundary protection.
• Perform Tier III troubleshooting of OT network outages, routing issues, and industrial protocol communications.
• Analyze network traffic using Wireshark and other protocol analysis tools.
• Support Risk Management Framework (RMF) activities, vulnerability remediation, STIG implementation, and cybersecurity compliance.
• Develop network topology diagrams, SOPs, system baselines, and technical documentation.
• Support Military Construction (MILCON) projects, design reviews, commissioning efforts, and modernization initiatives.
• Coordinate with cybersecurity personnel, facility engineers, and system vendors to maintain secure, reliable operations.

Required Qualifications

• Active Top Secret (Tier 5) security clearance or ability to obtain an Interim T5.
• U.S. Citizenship required.
• Minimum 5 years of advanced network administration experience.
• Minimum 3 years supporting Operational Technology (OT), Industrial Control Systems (ICS), SCADA, Building Management Systems (BMS), or Facility-Related Control Systems (FRCS).
• Experience with industrial networking technologies and protocols, including BACnet/IP, Modbus TCP, DNP3, or similar.
• Experience implementing network segmentation, firewall management, and OT cybersecurity best practices.
• Working knowledge of RMF, STIGs, NIST SP 800-82, and DoD cybersecurity requirements.
• Excellent troubleshooting, analytical, communication, and documentation skills.

Required Certifications

Candidates must possess at least one DoDM 8140-approved certification, such as:

• Security+
• SSCP
• Cloud+
• CEH
• GSEC
• GCIH
• GICSP

Higher-level certifications are highly desirable, including:

• CCSP
• SecurityX (CASP+)
• CCNA / CCNP
• GCIA
• GCED

Additional Cisco Industrial Networking or Palo Alto certifications are a plus.

Preferred Experience

• Cisco Industrial Ethernet
• Allen-Bradley Stratix
• Siemens RuggedCom
• Palo Alto NGFW
• Data Diodes
• Wireshark
• Industrial switching and routing
• OT network architecture
• MILCON project support
• Navy or DoD facility environments