Operational Technology (OT) Network Security Analyst

NorthMark Compute & Cloud; Spartanburg (SC); On-site; USD 120,000 - 165,000; Full time

Benefits offered by this job

Lunch stipend

Medical benefits

Dental & Vision

Parental leave

EAP

Life insurance

Disability insurance

401(k) match

Voluntary benefits

Paid time off

Job summary

NorthMark Compute & Cloud is seeking a Senior/Lead OT Network Security Analyst to protect critical industrial systems in Spartanburg County, SC. You will deploy and manage Nozomi Guardian, Vantage, and Arc across OT networks to monitor assets, detect anomalies, and respond to threats.

You will collaborate with engineering and plant operations to onboard new OT assets, develop detection rules, and mentor junior analysts while improving security playbooks and reporting.

Qualifications

• Minimum 5+ years of cybersecurity experience with 3+ years in OT/ICS monitoring.
• Hands-on with Nozomi Guardian, Vantage and Arc in industrial settings.
• Solid understanding of OT/ICS environments and protocols (Modbus, DNP3, EtherNet/IP, PROFINET).
• Experience with SIEM and log correlation in hybrid IT/OT environments.
• Familiarity with IEC 62443 and NIST SP 800-82; relevant certifications preferred.

Responsibilities

• Operate Guardian sensors across OT networks for visibility and threat detection.
• Use Vantage for centralized management and cross-site monitoring.
• Deploy Arc agents for endpoint visibility within OT environments.
• Triage alerts and incidents; coordinate with incident response.
• Maintain OT asset inventories and topology maps; develop detection rules and dashboards.
• Collaborate with engineering and plant operations to onboard assets and maintain coverage.
• Contribute to OT security policies, playbooks and training.

Skills

Cybersecurity

OT/ICS monitoring

SIEM experience

Industrial protocols knowledge

Python/PowerShell scripting

Tools

Nozomi Guardian

Nozomi Vantage

Nozomi Arc

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 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)

Benefits & Perks

• 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

It is impossible to list every requirement for, or responsibility of, any position. Similarly, we cannot identify all the skills a position may require since job responsibilities and the Company's needs may change over time. Therefore, the above job description is not comprehensive or exhaustive. The Company reserves the right to adjust, add to or eliminate any aspect of the above description. The Company also retains the right to require all employees to undertake additional or different job responsibilities when necessary to meet business needs.

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

EQUAL OPPORTUNITY EMPLOYER

NORTHMARK STRATEGIES LLC IS AN EQUAL EMPLOYMENT OPPORTUNITY EMPLOYER. THE COMPANY'S POLICY IS NOT TO DISCRIMINATE AGAINST ANY APPLICANT OR EMPLOYEE BASED ON RACE, COLOR, RELIGION, NATIONAL ORIGIN, GENDER, AGE, SEXUAL ORIENTATION, GENDER IDENTITY OR EXPRESSION, MARITAL STATUS, MENTAL OR PHYSICAL DISABILITY, AND GENETIC INFORMATION, OR ANY OTHER BASIS PROTECTED BY APPLICABLE LAW. THE FIRM ALSO PROHIBITS HARASSMENT OF APPLICANTS OR EMPLOYEES BASED ON ANY OF THESE PROTECTED CATEGORIES.