Operational Technology (OT) Network Security Analyst

NorthMark Strategies • Spartanburg, SC

4d • Onsite

About 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.

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.
• Must be legally authorized to work in the United States without the need for employer sponsorship, now or at any time in the future.

Nice To Haves

• 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)

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.

Benefits

• Company-Paid Lunch Stipend: Lunch is provided via GrubHub
• Company-Paid Benefits: 100% Employer-Paid Medical in our High Deductible Health Plan, Dental and Vision benefits for employees and their families, 16 weeks of Paid Parental Leave, Employee Assistance Program, Life insurance, Short-Term Disability and Long-Term Disability
• 401(k): Company will match 100% of your contributions up to 6%
• Optional Employee-Paid Benefits: Medical insurance in our PPO plan and a variety of other benefits such as Health Savings Accounts (with Company Contribution!), Flexible Spending Accounts, Supplemental Life Insurance, Wellhub and more.
• Time Off: 25 days of Paid Time Off plus 12 company holidays

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed