Overview
The OT Security Architect will lead the discovery phase at a nominated comparator plant, setting the security architecture direction for the facility. This hands-on role demands expertise in operational technology (OT) security to effectively translate complex, multi-vendor environments into actionable architectural recommendations. The position involves close collaboration with engineering, operational technology, infrastructure, and OEM stakeholders to ensure the proposed security architecture is both practical and scalable.
Responsibilities
- Lead discovery at a nominated comparator plant, assessing OT security tooling, configuration, architecture, and alignment with NIST SP 800-82 and the Purdue Model.
- Own the capability and control map, documenting reuse, extensions, and new decisions, supported by clear rationale and evidence.
- Identify and validate regulatory, hosting, connectivity, OEM, and other environmental constraints, while maintaining a divergence register for unmet requirements.
- Develop the MVP security architecture recommendation with security patterns, design decisions, and exceptions requiring client approval.
- Define the sequenced delivery roadmap, implementation scope, dependencies, and acceptance criteria for the subsequent build phase.
- Produce clear, high-quality architecture documentation and communicate technical recommendations to both technical and senior stakeholder audiences.
Requirements
- Deep, hands-on OT/ICS security architecture experience in industrial or critical infrastructure environments.
- Expert knowledge of NIST SP 800-82 and the Purdue Model with proven application to target-state OT architectures.
- Strong understanding of IEC 62443, including zone and conduit modelling within industrial environments.
- Experience developing capability and control maps, architecture decision records, and other structured architecture artefacts.
- Ability to assess and validate regulatory and environmental constraints within complex OT settings.
- Strong skills in High-Level Design (HLD) and architecture documentation, delivering independently.
- Experience collaborating with OEMs and technology vendors in multi-vendor OT environments.
- Excellent stakeholder engagement and communication skills, translating complex technical requirements into clear architectural decisions.