OT Cybersecurity Engineer – Industrial Control Systems, Singapore

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What

Where

Develop and implement cybersecurity measures across operational technology environments within power generation and water treatment facilities.

Design and maintain OT network architecture, ensuring proper segmentation between IT and OT environments (including Purdue Model Levels 0–3.5).

Harden ICS assets such as HMIs, PLCs, RTUs, DCS, SCADA systems, and engineering workstations.

Ensure secure IT/OT integration and apply regular patching or compensating controls to OT assets.

Conduct risk assessments and ensure compliance with NIST CSF, ISO 27001:2022, and Singapore's CII regulations (CCoP by CSA, WSCP by PUB).

Support alignment with Company's Group Cybersecurity Framework (based on NIST CSF)

Ensure compliance with IEC 62443 / ISA 99 standards for industrial automation and control system security. (

Support audits and regulatory reviews (including CSA and PUB assessments) to maintain a robust cybersecurity posture across critical infrastructure.

Monitor OT systems for anomalies using cybersecurity tools (e.g., SIEM, Claroty, Nozomi).

Lead incident response efforts for OT cyber incidents, coordinating with O&M teams, IT/OT cybersecurity teams, and external incident response partners (e.g., Black Panda, EY).

Ensure all alerts are managed in a standardised, well-defined, and efficient manner in alignment with Company’s policy.

Execute first-responder actions and follow-up responses per Company's Cyber Security Incident Response Procedures for CII and non-CII OT sites. Documentation & Asset Management

Maintain accurate documentation of network topologies, asset inventories, and OT security configurations.

Ensure all ICS assets are properly catalogued, including SCADA, HMI, PLC, substations, inverters, RTUs, data loggers, firewalls, and anti-virus software across wind, solar, and power generation sites.

Physical & Network Security

Enforce physical security controls for ICS assets — locked racks, panels, rooms, secured cabling, and camera surveillance at perimeter access points.

Implement and manage data diodes, firewalls, network segmentation, and access controls per Company’s OT security requirements.

Collaborate with internal teams (O&M, Maintenance IAC, Group Digital / Tech Risk Governance) and external vendors.

Deliver cybersecurity awareness training to plant personnel, ensuring frequency of at least once per year with regular awareness messaging.

Provide security advisory for new OT projects, including remote operations by third-party vendors.

Requirements

Education

Bachelor's degree in Engineering, Cybersecurity, Control Systems, or a related field.

Experience

Minimum 3–5 years of experience in OT cybersecurity, preferably in the energy, utilities, or critical infrastructure sector.

Well-experienced in at least one major industrial control system (e.g., Siemens PCS 7, ABB 800xA, Honeywell PKS, GE Mark VIe, etc.).

Technical Skills

Area Requirements

OT Security Tools Claroty, Nozomi, Dragos, or equivalent ICS cybersecurity platforms

ICS/SCADA Systems DCS, SCADA, HMI, PLC, RTU hardening and configuration

Vulnerability Management Patch management, compensating controls, penetration testing coordination

Certifications (Preferred)

GICSP (Global Industrial Cyber Security Professional)

CISSP (Certified Information Systems Security Professional)

CISM (Certified Information Security Manager)

SANS ICS/OT certifications (e.g., ICS515, ICS410)

CCNP, PCNSE, NSE 1/2/3/4 are advantageous

Soft Skills

Strong analytical and problem-solving abilities

Excellent verbal and written communication skills

Ability to work independently and as part of a small, agile OT cybersecurity team

Proactive attitude with commitment to continuous learning in the evolving OT threat landscape

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