Operational Technology (OT) Network Security Analyst

NorthMark Compute & Cloud; Spartanburg (SC); On-site; USD 120,000 - 150,000; Full time

Job summary

NorthMark Compute & Cloud in Spartanburg County, SC seeks a Senior/Lead OT Network Security Analyst to monitor OT assets using Nozomi Guardian, Vantage, and Arc, protecting critical industrial systems across sites.

You will triage alerts, analyze traffic, and collaborate with engineering and operations to strengthen detection coverage and incident response capabilities. Strong OT/ICS expertise and Nozomi experience are required.

Qualifications

• 5+ years in cybersecurity with OT/ICS monitoring.
• Hands-on with Nozomi Guardian, Vantage and Arc.
• Knowledge of OT/ICS environments and protocols.
• Experience with SIEM and log correlation in hybrid IT/OT.
• Familiarity with IEC 62443 and NIST SP 800-82.
• Certifications preferred: GICSP, Nozomi Certified Expert, CSSA.

Responsibilities

• Operate Nozomi Guardian sensors across OT segments for asset visibility and threat detection.
• Use Nozomi Vantage for centralized management, dashboards, and cross-site monitoring.
• Deploy Nozomi Arc agents for OT endpoint visibility.
• Triage security alerts and correlate with SIEM tools.
• Maintain OT asset inventory and topology maps.
• Develop detection rules and dashboards in Nozomi Vantage.
• Analyze OT network traffic for anomalies and unauthorized devices.
• Support incident response for OT events.
• Produce actionable security reports for teams/leaders.
• Collaborate with engineering and plant operations to onboard new OT assets.
• Contribute to OT security policies and playbooks.
• Mentor junior analysts.

Skills

OT/ICS security monitoring

Nozomi Networks experience

SIEM analytics

Industrial protocols

Scripting (Python/PowerShell)

Critical infrastructure domain

Tools

Nozomi Guardian

Nozomi Vantage

Nozomi Arc

SIEM platforms

Job description

The Company

NorthMark Compute & Cloud (NMC²) is backed by dedicated leadership and investment, with a clear mission as it operates at the bleeding edge of technology. Its goal is to scale and enhance the high-performance computing (HPC) and cloud infrastructure that supports its clients' research, production, and delivery, enabling breakthroughs that shape the industries of tomorrow. Its engineers build critical infrastructure to eliminate friction in scientific research, simulations, analysis, and decision-making, accelerating discovery and driving faster innovation.

The Company

NorthMark Compute & Cloud (NMC²) is backed by dedicated leadership and investment, with a clear mission as it operates at the bleeding edge of technology. Its goal is to scale and enhance the high-performance computing (HPC) and cloud infrastructure that supports its clients' research, production, and delivery, enabling breakthroughs that shape the industries of tomorrow. Its engineers build critical infrastructure to eliminate friction in scientific research, simulations, analysis, and decision-making, accelerating discovery and driving faster innovation.

The Position

We are seeking an experienced Senior/Lead OT Network Security Analyst based in Spartanburg County, SC. You will leverage Nozomi Networks solutions, including Guardian, Vantage, and Arc, to monitor OT assets, identify anomalies, and protect critical industrial systems.

Responsibilities

• Operate and administer Nozomi Networks Guardian sensors across OT network segments for asset visibility and threat detection.
• Utilize Nozomi Vantage for centralized management, dashboarding, and cross-site OT security monitoring.
• Deploy and manage Nozomi Arc agents for endpoint visibility within OT environments.
• Triage and investigate security alerts generated by Nozomi and correlated with SIEM tools, prioritizing OT-specific risk.
• Maintain and improve OT asset inventory, network topology maps, and communication baselines.
• Develop custom detection rules, alert thresholds, and dashboards within Nozomi Vantage.
• Conduct detailed OT network traffic analysis to identify unauthorized devices, lateral movement, and protocol anomalies.
• Support incident response activities related to OT network security events.
• Produce clear and actionable security reports for technical teams and leadership.
• Collaborate with engineering and plant operations teams to onboard new OT assets and maintain detection coverage.
• Contribute to OT security policies, procedures, and playbooks.
• Mentor junior analysts and support team capability development.

Requirements

• 5+ years cybersecurity; 3+ years OT/ICS network monitoring or analysis.
• Hands-on operational experience with Nozomi Networks: Guardian, Vantage, and Arc.
• Understanding of OT/ICS environments, industrial protocols (Modbus, DNP3, EtherNet/IP, PROFINET), and asset types.
• Experience with SIEM platforms and log correlation in hybrid IT/OT environments.
• Knowledge of network segmentation principles and OT-specific security architectures.
• Familiarity with IEC 62443 and NIST SP 800-82.
• Certifications preferred: GICSP, Nozomi Networks Certified Expert, CSSA, or equivalent.
• Experience in manufacturing, energy, utilities, or critical infrastructure sectors (preferred)
• Exposure to additional OT security platforms such as Claroty, Nozomi or Dragos (preferred)
• Scripting skills (Python, PowerShell) for automation of reporting or alerting workflows (preferred)