Senior OT Security Specialist

Ornua

OT Security Specialist responsible for safeguarding Ornua’s OT infrastructure against cybersecurity threats. Collaborating globally to ensure compliance with IT & OT policies within the food and diary manufacturing sector.

Posted 5/25/2026full-timeDublin • 🇮🇪 IrelandSeniorWebsite

Tech Stack

Tools & technologies

AzureCyber SecurityFirewalls

About the role

Key responsibilities & impact

Provide on-going support in assisting group IT security team in the execution, managing and monitoring of global OT cybersecurity program activities across group industrial sites.
Manage up-to date documentation of existing OT security controls, solutions, network architecture and processes to ensure compliance with global IT & OT security policies and applicable regulatory standards.
Monitor and manage group security approved specialised OT Security passive discovery solution providing identification of assets, traffic flows, vulnerabilities and threat / anomaly detection.
Conduct security risk analyses on segmentation of traffic flows between IT and OT network segments and vulnerabilities identified in the OT systems and components (e.g. SCADA, PLCs, HMIs, workstations, handheld and other special purpose devices).
Monitor and manage the use of identity and access management and endpoint related security controls including hardening and USB controls/inspection.
Ensuring all types of staff or vendor remote access into the OT networks is identified, documented and deployed using group approved secure OT remote access solution.
Coordinate with OEM vendors to apply security updates during scheduled sanitation windows.
Facilitate and foster cross collaboration between group IT security and local plant operations teams on new implementations to ensure a resilient OT infrastructure.
Bridge the gap between IT security requirements and OT engineering realities, fostering a culture of shared responsibility.
Monitor OT environments for security incidents, analyse security logs, and investigate alerts to detect and respond to cyber threats in a timely manner.
Provide OT cybersecurity awareness training and support to Operations and engineering personnel to promote a culture of security awareness and compliance.
Supporting execution of routine internal and external OT security assessments projects.
Stay updated on the latest developments in industry 4.0 concepts, cybersecurity threats, trends, and technologies, and apply this knowledge to improve OT security posture.

Requirements

What you’ll need

Bachelor’s degree in industrial automation/instrumentation, computer science, Information Security, or a related field is preferred but not mandatory.
5-6 years of experience working in an OT or industrial environments (preferrable in Food & Diary manufacturing) with a focus on cybersecurity is preferred.
Understanding of specialised OT Security solutions for OT asset discovery, vulnerability identification and anomaly / threat detection.
Understanding of OT/industrial processes, protocols (Modbus, OPC UA, OSI Pi, SL7, MQTT etc.) and systems (e.g. SCADA/DCS, PLCs, HMIs, etc.) typically used in food & diary manufacturing.
Familiar with Safety and Hazard analysis on OT processes.
Familiarity with cybersecurity standards and regulations, such as NIS2, ISA/IEC 62443, ISO 27001 and NIST OT Security guidelines.
Understanding in network security concepts, tools, and technologies, including firewalls, encryption, IDS/IPS, and VPNs.
Strong analytical and problem-solving skills, with the ability to analyse complex security incidents and recommend effective countermeasures.
Knowledge of Microsoft Security suite (MS O365 Defender, Azure ATP, O365 ATP and CAS etc..) would be an advantage.
Excellent communication and collaboration skills, with the ability to interact with technical and non-technical stakeholders effectively.
Industry certification like GICSP, ISA/IEC 62443 cybersecurity expert, Certified SCADA Security Architect (CSSA), or CISSP are a plus.

Benefits

Comp & perks

Accessibility at Ornua
support for a range of reasonable accessibility needs during employment

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

OT cybersecuritysecurity risk analysisvulnerability identificationanomaly detectionnetwork securityfirewallsencryptionIDS/IPSVPNsindustrial automation

Soft Skills

analytical skillsproblem-solving skillscommunication skillscollaboration skills

Certifications

GICSPISA/IEC 62443 cybersecurity expertCertified SCADA Security ArchitectCISSP