Operational Technology (OT) Network Security Analyst
NorthMark · Spartanburg
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)
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.
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
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.