Network Administrator

Quantum World Technologies Inc.; San Diego (CA); On-site; USD 80,000 - 100,000; Full time

Job summary

A tech company in the United States seeks a Mid-Senior level network and systems administrator to maintain and secure the control system network infrastructure. Responsibilities include managing network infrastructure, implementing cybersecurity policies, and providing after-hours support. Ideal candidates hold a Bachelor’s degree in IT or Cybersecurity with 4+ years of experience in network administration.

Qualifications

• 4+ years of experience in network or systems administration.
• Familiarity with industrial control systems (DCS, SCADA, or PLC-based networks).
• Knowledge of cybersecurity frameworks and governance practices (e.g., NIST, ISA/IEC 62443).

Responsibilities

• Administer and maintain Windows, Unix/Sun systems, and associated servers.
• Manage network infrastructure (switches, routers, firewalls, fiber) used in control and monitoring systems.
• Monitor system health, logs, and network performance for early issue detection.

Skills

Network protocols

Routing

VLANs

Segmentation

Firewall administration

Security rule management

System documentation

Configuration management

Education

Bachelor’s degree in IT, Cybersecurity, or related field

Job description

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Maintaining and securing the control system network infrastructure. Ensures operation of network, server, and cybersecurity systems supporting industrial automation environments.

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.

Qualifications

• 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.

Preferred

• 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.

Seniority level

Mid-Senior level

Employment type

Contract

Job function

Information Technology

Industries

IT Services and IT Consulting

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