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.
Desirable
• 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
