Vallum Associates
OT Architect
United Kingdom
Posted about 21 hours ago
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The Role: OT Architect
Location: Sheffield, UK
Position Type: Contract Inside IR35
Remote work option: Available Remote
Job Description:
SKILLS/COMPETENCIES
Essential
- Deep, real-world OT/ICS architecture experience within industrial, manufacturing, utilities, or critical infrastructure environments.
- Proven experience acting as a technical design authority or lead architect for OT networks, security architecture, and operational resilience programmes.
- Strong understanding of IT/OT convergence, architectural integration patterns, and associated risk.
- Expert working knowledge of IEC 62443, including zone/conduit modelling, and its practical application in target-state OT architecture design.
- Practical understanding of industrial protocols (e.g., Modbus, DNP3, OPC-UA, Profinet) and their architectural implications for segmentation and secure design.
- Experience defining and owning reference architectures, technical standards, and design principles across large-scale OT/critical infrastructure estates.
- Strong OT risk management capability, with the ability to translate threat and risk assessments into architectural decisions and mitigation designs.
- Experience working with, and providing technical governance over, integrators, OEM vendors, and engineering partners.
- Familiarity with enterprise architecture frameworks/practices (e.g., TOGAF, SABSA) and experience presenting designs to architecture review boards or senior technical governance forums is advantageous.
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Desirable
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- Experience within a large global, regulated, or systemically important organisation.
- Experience across multiple OT environments, building types, regions, or operating models.
- Knowledge of building management systems, physical access control, CCTV, fire and life-safety systems, energy management, environmental monitoring, or data centre operational systems.
- Experience with OT asset visibility, cyber-physical systems platforms, network monitoring, or security monitoring technologies.
- Understanding of enterprise architecture frameworks and architecture governance processes.
- Knowledge of relevant standards and guidance such as NIST Cybersecurity Framework, NIST SP 800-82, ISO/IEC 27001, NIS2, or sector-specific regulatory requirements.
- Experience designing for legacy systems, long equipment lifecycles, constrained maintenance windows, and high availability environments.
- Experience supporting procurement, commercial evaluation, technical due diligence, or supplier assurance.
- Relevant architecture, cyber security, networking, engineering, or IEC 62443 qualifications.
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Skills
OT/ICS Architecture
IEC 62443
IT/OT Convergence
Industrial Protocols
Network Segmentation
OT Risk Management
Technical Governance
Reference Architecture
TOGAF
SABSA
NIST Cybersecurity Framework
ISO/IEC 27001
NIS2
Cyber-Physical Systems
Asset Visibility
Operational Resilience
Location