Operational Technology (OT) Network Administrator
On-siteGuam, Gwangju, Republic of Korea
Job Summary
Conduct advanced network administration, troubleshooting, and maintenance of IT/OT environments supporting DoD facility operations in Guam. Configure, maintain, and troubleshoot network infrastructure including routers, switches, VLANs, routing protocols, firewalls, ACLs, and network segmentation solutions. Support secure integration and operation of Operational Technology (OT), Industrial Control Systems (ICS), SCADA, Building Management Systems (BMS), and Facility Related Control Systems (FRCS). Develop and maintain firewall rules, access controls, and network security configurations to support secure and deterministic traffic flows. Apply DoD cybersecurity requirements, including STIG compliance, vulnerability remediation, and secure configuration management within OT environments. Analyze network performance metrics including bandwidth utilization, latency, jitter, packet loss, and connectivity issues. Utilize packet capture and analysis tools such as Wireshark to troubleshoot network communication issues. Develop and maintain network documentation including topology diagrams, configuration backups, and technical reports. Coordinate with government personnel, engineers, vendors, and mission stakeholders to resolve technical issues. Prepare technical documentation, reports, correspondence, and status updates for government leadership and project stakeholders.
Required Qualifications
- An active, in-scope US Government issued Top Secret clearance
- Must possess at least one (1) approved intermediate certification: Security+, CEH, Cloud+, GCIH, GICSP, GSEC, or SSCP
- Must possess at least one (1) approved advanced certification: SecurityX (CASP+), CCNA, CCNP Security, CCSP, GCED, GCIA, GCLD, GDSA, or GFACT
- Minimum of 5 years of advanced network administration experience
- Minimum of 3 years of experience supporting OT, ICS, SCADA, BMS, FRCS, or IT/OT network environments
- Routing and switching
- VLAN configuration
- Firewall administration
- ACL development
- Network segmentation
- Network troubleshooting
- Experience supporting cybersecurity requirements in operational environments where changes must be carefully managed to avoid impacting physical systems or facility operations
- Ability to communicate effectively with government customers, technical teams, and stakeholders
- Experience preparing technical documentation, reports, and correspondence
- Proficiency with Microsoft Office Suite (Word, Excel, PowerPoint, Outlook)
- Standing and walking for extended periods
- Working in mechanical/equipment rooms
- Climbing ladders
- Bending, crouching, and reaching
- Lifting and moving equipment up to 25 pounds
- U.S. Citizenship
Desired Qualifications
- Computing Environment (CE) Certifications: The following relevant network operating system, routing/switching, or firewall environment certifications are highly desirable: Cisco CCNA/CCNP, Palo Alto PCNSA/PCNSE, Juniper JNCIA/JNCIS, or Cisco Managing Industrial Networks with Cisco Networking Technologies (IMINS)
- Experience supporting Department of Defense facility systems or mission-critical infrastructure
- BACnet/IP
- Modbus TCP
- DNP3
- CIP
- LonWorks
- Cisco Industrial Ethernet
- Allen-Bradley Stratix
- Ruggedcom
- Similar industrial switching platforms
- Experience with next-generation firewalls such as Palo Alto, Cisco, or Fortinet
- Purdue Model architecture
- NIST SP 800-82
- ISA/IEC 62443
- Ports, Protocols, and Services Management (PPSM)
- Data diodes/unidirectional gateways
- Experience supporting facility modernization, MILCON/SRM projects, or system integration efforts
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