Manager / Assistant Manager - OT Cyber Security

Location:  Johannesburg

Other locations:  Primary Location Only

Salary: Competitive

Date:  Jul 16, 2026

Job description

Requisition ID:  1723372

Manager / Assistant Manager – OT Cyber Security

Overview

EY South Africa is looking to strengthen its Operational Technology (OT) Cyber Security capability with experienced OT cybersecurity professionals at Assistant Manager and Manager level.

We are specifically seeking candidates with hands-on OT, ICS and critical infrastructure experience who are comfortable working in operational environments such as mining, utilities, power generation, manufacturing and oil & gas.

This role will require regular travel and, in some cases, extended periods at client sites across South Africa and the broader Africa region.

What We Are Looking For

Assistant Manager

• 5–8 years relevant experience.

Manager

• 8–12 years relevant experience.

Candidates must have practical experience in one or more of the following sectors:

• Mining

• Utilities

• Power Generation

• Oil & Gas

• Manufacturing

• Critical Infrastructure

Required Technical Experience

• OT Cyber Security Assessments

• ICS Security

• SCADA Security

• OT Risk Assessments

• Vulnerability Assessments

• Security Architecture Reviews

• Network Segmentation

• Asset Discovery

• OT Governance and Compliance

• Incident Response within OT environments

Preferred Framework Experience

• ISA Standards

Preferred Technologies

• Nozomi
• Claroty
• Microsoft Defender for IoT
• Tenable.ot
• Splunk
• Microsoft Sentinel

Preferred Certifications

One or more of the following:

• ISA/IEC 62443 Specialist Certifications

• Security+

• Nozomi Certifications

• Claroty Certifications

Additional Requirements

• Must be willing to travel extensively.

• Must be comfortable spending extended periods at remote client locations.

• Strong report writing and client engagement skills.

• Ability to conduct workshops, interviews and site assessments.

Key Success Factors

• Deep OT and ICS knowledge.
• Ability to work effectively in operational environments.
• Strong understanding of IEC 62443 and OT security principles.
• Practical experience rather than purely governance-focused experience.

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EY refers to the global organization, and may refer to one or more, of the member firms of Ernst & Young Global Limited, each of which is a separate legal entity. Ernst & Young Global Limited, a UK company limited by guarantee, does not provide services to clients.

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