OT Architect - Remote

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