Job Title: OT Cybersecurity Engineer – Purdue Level 1/2 Zoning & Firewall Design
Location: Baton Rouge, LA
Contract 12 months
Must Have: ICS Exp, TWIC Card needed.
Role Overview:
We are seeking a highly skilled Operational Technology (OT) Cybersecurity Engineer with deep expertise in industrial control system (ICS) security architecture, focusing on Purdue Model Level 1 and Level 2 zoning , firewall configuration, and secure network segmentation within complex refinery and chemical processing environments. The ideal candidate will possess hands-on experience designing and implementing OT cybersecurity zones and controls that comply with NIST 800-82 , ISA/IEC 62443 , and other industry best practices. This role requires both technical acumen and the ability to perform detailed on-site assessments, vulnerability analysis, and operational risk mitigation in highly secure industrial facilities.
Key Responsibilities:
OT Network Security Architecture & Firewall Design
• Develop and implement Purdue Model Level 1/2 network zones including secure segmentation of ICS devices (PLCs, HMIs, RTUs) from enterprise IT systems.
• Build, review, and maintain detailed firewall rulesets using vendor platforms such as Palo Alto, Fortinet , ensuring least privilege access and protocol whitelisting.
• Design and deploy DMZs , data diodes , and read-only gateways to enable secure one way data flow between OT and IT domains, preventing lateral movement of threats.
• Collaborate with network and OT engineers to design resilient, redundant, and fail-safe architectures in compliance with industry standards.
Onsite Security Assessments & Asset Discovery
• Conduct comprehensive plant walkthroughs to assess OT network topology, device configurations, and physical security controls.
• Perform asset discovery and classification using tools like Tenable OT , Dragos , or other ICS vulnerability scanners.
• Identify and document vulnerabilities, risks, and compliance gaps, producing actionable reports and mitigation plans for OT teams.
• Work closely with process and maintenance personnel to align cybersecurity initiatives with operational requirements and constraints.
Automation, Monitoring & Incident Response
• Develop and maintain PowerShell and Python scripts for automated log monitoring, anomaly detection, and incident alerting across OT infrastructure.
• Integrate log sources into Security Information and Event Management (SIEM) platforms while ensuring OT-specific telemetry is correctly interpreted.
• Support incident response efforts by performing root cause analysis and remediation for OT-related cybersecurity events.
Compliance & Standards Alignment
• Apply NIST 800-82 , ISA/IEC 62443 , CISA energy sector guidelines, and other relevant cybersecurity frameworks to ensure regulatory compliance.
• Prepare and maintain technical documentation including firewall policies, network diagrams, asset inventories, and cybersecurity policies tailored for OT environments.
• Liaise with third-party auditors and regulators during cybersecurity audits and assessments.
Must-Have Qualifications & Skills:
• Minimum 10+ years of experience in industrial control system (ICS) cybersecurity , specifically within energy, oil & gas, or chemical sectors.
• Proven track record designing and implementing Purdue Model Level 1 and 2 zones , secure firewall configurations, and DMZ architectures in OT environments.
• Expertise configuring and managing firewalls and network security appliances from Palo Alto , Fortinet , or equivalent platforms in ICS/OT settings.
• Hands-on experience with asset discovery and vulnerability assessment tools such as Tenable OT , Dragos , Claroty or Nozomi .
• Proficient in PowerShell and Python scripting for automation of security monitoring and operational controls.
• Strong understanding of ICS protocols (Modbus, DNP3, OPC-UA) and OT network architectures.
• Excellent communication skills for cross-team collaboration and report writing.
• TWIC Card needed for secure site access.
Preferred Skills & Certifications:
• Certifications such as GICSP (Global Industrial Cyber Security Professional) , ISA/IEC 62443 Cybersecurity Expert , CISSP , or CEH .
• Familiarity with SIEM tools like Splunk, QRadar, or ArcSight integrated with OT telemetry.
• Experience with ICS Incident Response , digital forensics in OT environments, and industrial malware detection techniques.
• Prior experience working with similar large energy/refining companies.
Work Environment & Travel:
• Role requires onsite presence in Baton Rouge, LA , with frequent field visits to chemical/refinery plant areas.
• Must adhere to all safety, security, and operational protocols, including wearing proper PPE and following plant access procedures.
• Will be required to participate in shift work , emergency on-call rotations , and incident response drills as necessary.
...-oriented leader to oversee sanitation operations in a dynamic food manufacturing environment. This role ensures that all sanitation... ...meet the highest standards of cleanliness, safety, and regulatory compliance. Key Responsibilities: Team Leadership: Direct...
...infrastructure organization headquartered in Santa Monica, California. We are currently seeking an experienced and motivated Sales Trainer to support the expansion and development of the company's commercial sales team. If you believe your background and expertise...
...SaaS company is hiring Remote Night Shift Chat Support Agents to join its international customer... ...offers a legitimate way to earn income from home, build digital communication skills,... ...-phone, entry-level overnight job that works with your lifestyle, this role is built...
...We are looking for an energetic, driven, and detail-oriented Remote Travel Consultant. Our Travel Consultants play a key role in our travel team building itineraries, crafting emails, performing hotel rate checks, arranging concierge services, corresponding with suppliers...
...Drive, Williston, VT, is hiring Part Time drivers to deliver home furnishings and other... ...license (CDL) is NOT required but a DOT medical certificate is. Priority Express pays for... ...ETA and any special requirements. Most deliveries will be left just inside the front door...