Security Architect – OT / Network / PKI
New World Management · Sydney, NSW, Australia ·
- Category
- Security
- Experience
- 8+ years
Security Architect – OT / Network / PKI
Energy Sector | Critical Infrastructure | Hybrid (Australia)
The Role
A major critical infrastructure organisation is seeking a Security Architect to lead the design and implementation of security across complex Operational Technology (OT) environments.
This is a hands-on architecture role, responsible for securing live environments across network, identity, and PKI domains — not a governance-only position.
You'll play a key role in a large-scale cyber uplift program, shaping how security is implemented across OT systems that underpin essential services.
Key Responsibilities
- Design and deliver end-to-end OT security architecture
- Develop High-Level and Low-Level Designs (HLD/LLD) across key platforms
- Lead network segmentation and firewall architecture (IEC 62443 aligned)
- Own PKI architecture (CA hierarchy, HSM integration, certificate lifecycle)
- Implement and govern NAC solutions (Cisco ISE / Aruba ClearPass)
- Translate AESCSF, SOCI Act, IEC 62443 into enforceable technical controls
- Contribute to OT SIEM and detection capability (e.g. Microsoft Sentinel)
- Provide technical leadership and risk input to senior stakeholders
About You
Essential Experience
- 8+ years in cyber security / network security architecture
- Strong experience in OT / ICS or critical infrastructure environments
- Proven delivery of complex architecture artefacts (HLD, LLD, threat models)
- Deep expertise in:
- Network segmentation & firewall design
- PKI architecture and certificate lifecycle management
- NAC implementation (802.1X, profiling, policy enforcement)
- Experience with OT protocols (e.g. SCADA, DNP3, IEC 61850, Modbus)
Regulatory Experience
- Exposure to Australian frameworks such as:
- AESCSF
- SOCI Act
- Essential Eight
Desirable
- Microsoft Sentinel / Defender for IoT
- Azure (ExpressRoute, Arc, Private Endpoints)
- HSM technologies (e.g. Thales)
- Energy sector experience
- The ability to successfully obtain baseline security clearance
Why Apply
- Work on systems of national significance
- Join a major cyber uplift program with real investment
- High-impact role with visibility across executive and regulatory stakeholders
- Exposure to real-world OT environments (substations, control systems)
- Long-term opportunity in a critical infrastructure domain
If you have what we are looking for and are looking for your next engagement, APPLY NOW.