Job Description:

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.