We are seeking an experienced OT Cybersecurity Engineer with 5-10 years of relevant experience to join our Global Capability Centre (GCC) team in Chennai or Madurai, India. The OT Cybersecurity Engineer is responsible for the assessment, design, engineering, implementation and lifecycle management of cybersecurity controls for Industrial Control Systems (ICS) and Operational Technology (OT) environments. The role supports both EPCI projects and operational facilities, ensuring that PLC, DCS, SCADA, SIS, industrial networks, servers and associated OT infrastructure are designed and maintained in accordance with cybersecurity, safety, availability and operational requirements. The engineer will apply recognised standards and frameworks such as IEC 62443, NIST CSF, NIST SP 800-82 and ISO/IEC 27001 while working closely with customers, project teams, operations, IT, automation engineers, OEMs and vendors.

Key Responsibilities
• Act as a technical focal point for OT cybersecurity within assigned projects and operational environments, ensuring compliance with customer requirements, project specifications and applicable cybersecurity standards.
• Perform and support OT cybersecurity risk assessments covering system definition, asset identification, threat and vulnerability assessment, zones and conduits, target security levels, risk evaluation and mitigation recommendations.
• Develop and review cybersecurity architectures and requirements covering network segmentation, firewalls, Industrial DMZ, secure remote access, identity and access management, endpoint protection, patching, backup and recovery, security monitoring and logging.
• Develop Cybersecurity Requirement Specifications and provide cybersecurity requirements to EPC contractors, OEMs, package vendors and system integrators. Review vendor designs and technical submissions for compliance.
• Participate throughout the project lifecycle including FEED, detailed engineering, design reviews, FAT, cybersecurity FAT, SAT, commissioning, verification and cybersecurity punch-list closure.
• Conduct or coordinate vulnerability assessments, hardening reviews, patch assessments and controlled penetration-testing activities while considering system availability,



process safety and OEM requirements.
• Support OT infrastructure and security technologies including industrial networks, firewalls, IDS/IPS/NIDS, Active Directory, Windows Server, virtualisation, endpoint security, patch-management systems, backup systems, SIEM and secure remote-access solutions.
• Maintain and validate OT asset inventories, configuration baselines, software/firmware information and access-control records, and support controlled cybersecurity change management.
• Support cybersecurity monitoring, incident response, backup and recovery validation, business continuity, disaster-recovery readiness and cybersecurity assurance activities.
• Support secure OT/IT integration and digitalisation initiatives while ensuring appropriate segmentation, controlled data flows and defence-in-depth security principles.
• Prepare engineering deliverables including cybersecurity management plans, design specifications, risk assessments, architecture documents, zone and conduit models, data-flow diagrams, compliance reports and cybersecurity test procedures.
• Support customer workshops, technical meetings, audits, proposals, technical clarifications and continuous improvement of Apeiron's OT cybersecurity methodologies and engineering practices. Travel to customer facilities, project sites, fabrication yards and offshore locations may be required. Technical Competence The candidate should demonstrate strong knowledge of industrial control-system environments including PLC, DCS, SCADA, SIS, F&G;, historians, engineering workstations, servers and industrial networks. Practical knowledge is expected in several of the following areas:
• Industrial networking and security: TCP/IP, VLANs, routing, firewalls, network segmentation and industrial communication protocols.
• OT infrastructure: Windows Server, Active Directory, virtualisation, network monitoring,



endpoint protection, patch management and backup/recovery.
• Cybersecurity: defence-in-depth, zones and conduits, system hardening, identity and access management, vulnerability management, secure remote access, logging, SIEM/NIDS and incident response.
• The engineer should understand the operational and safety implications of implementing cybersecurity controls within live industrial facilities and be capable of balancing security, safety, reliability and availability. Standards & Certifications
• Working knowledge of IEC 62443 is highly desirable, together with exposure to NIST SP 800-82, NIST CSF, ISO/IEC 27001, ISO/IEC 27019 and IEC 61511 where applicable.
• Relevant certifications such as ISA/IEC 62443, GICSP, CISSP, Security+, CEH, Functional Safety, Cisco, Microsoft or OEM cybersecurity certifications are advantageous but not mandatory.
• Practical OT cybersecurity engineering experience will be given significant consideration. Individual Competencies
• The successful candidate should demonstrate strong analytical and troubleshooting capability, sound engineering judgement, qualified integrity and attention to technical quality.
• The role requires effective communication with customers, engineers, operations, IT teams, OEMs, vendors and management, together with the ability to work independently and within multidisciplinary global project teams.
• A proactive approach, ownership mindset and willingness to continuously develop knowledge in industrial cybersecurity and emerging OT technologies are essential. Education & Experience
• Bachelor's Degree in Electrical, Electronics, Instrumentation & Control, Automation, Computer Engineering, Computer Science, Information Technology, Cybersecurity or a related engineering discipline.
• Candidates should preferably have 5-10 years of relevant industrial experience, including practical exposure to OT/ICS cybersecurity, industrial automation, industrial networking or control-system infrastructure.
• Experience within Oil & Gas, Offshore/FPSO, Maritime, Manufacturing, Energy, Utilities, Petrochemical or other critical infrastructure sectors is advantageous.

📌 OT Cybersecurity Engineer (Chennai)
🏢 Apeiron
📍 Chennai