Senior OT Network Security Lead | Nozomi Guardian Expert

NorthMark Strategies LLC; Spartanburg (SC); On-site; USD 120,000 - 150,000; Full time

Benefits offered by this job

Company-Paid Lunch Stipend

Employer-Paid Medical, Dental, Vision

Paid Parental Leave (16 weeks)

401(k) with Company Match

Flexible Benefits

Job summary

NorthMark Strategies LLC is seeking a Senior/Lead OT Network Security Analyst to oversee Nozomi Guardian, Vantage, and Arc deployments in Spartanburg, SC. You will monitor OT assets, analyze anomalies, and protect critical industrial networks in collaboration with engineering teams.

The role requires 5+ years in cybersecurity with 3+ years in OT/ICS monitoring, hands-on Nozomi experience, and familiarity with industrial protocols.

Qualifications

• 5+ years cybersecurity; 3+ years OT/ICS network monitoring or analysis.
• Hands-on experience with Nozomi Guardian, Vantage, and Arc.
• Understanding OT/ICS environments and industrial protocols (Modbus, DNP3, EtherNet/IP, PROFINET).
• Experience with SIEM platforms and log correlation in hybrid IT/OT environments.

Responsibilities

• Operate and administer Nozomi Guardian sensors across OT segments for asset visibility and threat detection.
• Utilize Nozomi Vantage for centralized management, dashboards, and cross-site OT monitoring.
• Deploy and manage Nozomi Arc agents for OT endpoint visibility.
• Triage and investigate security alerts, prioritizing OT risk in conjunction with SIEM.
• Maintain OT asset inventories and network topology maps.
• Develop custom detection rules and dashboards in Nozomi Vantage.
• Conduct OT network traffic analysis to identify unauthorized devices and anomalies.
• Support incident response activities for OT security events.
• Produce actionable security reports for technical teams and leadership.
• Collaborate with plant operations to onboard OT assets and ensure detection coverage.
• Contribute to OT security policies and playbooks.
• Mentor junior analysts and support team capability development.

Skills

OT Monitoring

Nozomi Guardian

Nozomi Vantage

Nozomi Arc

SIEM

Industrial Protocols

Python

PowerShell

Network Segmentation

Tools

Nozomi Guardian

Nozomi Vantage

Nozomi Arc

Job description

NorthMark Strategies LLC is seeking a Senior/Lead OT Network Security Analyst to oversee Nozomi Guardian, Vantage, and Arc deployments in Spartanburg, SC. You will monitor OT assets, analyze anomalies, and protect critical industrial networks in collaboration with engineering teams.

The role requires 5+ years in cybersecurity with 3+ years in OT/ICS monitoring, hands-on Nozomi experience, and familiarity with industrial protocols.