Network Administrator

Responsibilities

• Administer and maintain Windows, Unix/Sun systems, and associated servers.
• Manage network infrastructure (switches, routers, firewalls, fiber) used in control and monitoring systems.
• Configure and monitor firewalls, manage rule sets, and perform routine log reviews.
• Maintain user access controls, permissions, and account inventories for DCS/SCADA systems.
• Implement and enforce cybersecurity and governance policies in accordance with organizational and regulatory requirements.
• Maintain backups, perform patching, and ensure antivirus and endpoint protection are current.
• Monitor system health, logs, and network performance for early issue detection.
• Support secure data exchange between control systems, historians, and enterprise systems.
• Maintain accurate documentation for configurations, changes, and access records.
• Provide after-hours or on-call support for control system network issues.

• Bachelor’s degree in IT, Cybersecurity, or related field; or equivalent experience.
• 4+ years of experience in network or systems administration.
• Strong knowledge of network protocols, routing, VLANs, and segmentation.
• Experience with firewall administration and security rule management.
• Familiarity with industrial control systems (DCS, SCADA, or PLC-based networks).
• Knowledge of cybersecurity frameworks and governance practices (e.g., NIST, ISA/IEC 62443).
• Proficiency in system documentation and configuration management.

• Experience in OT or critical infrastructure environments.
• Familiarity with backup tools, patch management, and log monitoring utilities.
• Understanding of IT/OT network separation and secure data bridging.

Mid-Senior level

Contract

Information Technology

IT Services and IT Consulting

Location:

San Diego Metropolitan Area

Salary: $38 - $44 per hour