OT Architect

South Yorkshire, UK Vallum Associates The Role: OT Architect Location: Sheffield, UK Position Type: Contract Inside IR35 Remote work option Available: Remote Job Description: SKILLS/COMPETENCIES • 10+ years’ experience working with Operational Technology in large, complex estates, preferably across corporate buildings, critical facilities or datacentres • 5+ years’ experience designing, operating or security building OT systems such as BMS, HVAC. Electrical power systems, fire systems, lifts and SMART building platforms • Demonstratable experience uplifting immature or legacy OT environments, moving from minimal technical controls to defined security, architecture and governance standards • Strong practical experience applying IEC62443 in real-world OT and building technology environments with the ability to tailor controls to differing site risk profiles and operational constraints • Familiarity with building automation and OT vendors such as Siemens, Schneider Electric, Honeywell, Johnsons Controls or equivalent • Understanding of relevant regulatory and resilience frameworks (e.g. NIS2, DORA) and their impact on OT design and operations. • Familiarity with standards such as ISO 27001, NIST CSF, IEC 62443 ESSENTIAL • Demonstrable OT subject matter knowledge, including IEC 62443 concepts and practical application. • Experience with Cyber-Physical Solution deployments, configuration, risk management and reporting • Experience developing or applying structured methodologies (e.g., assessment, scoring, or attribution approaches). • Understanding of Purdue-aligned network segmentation and reference architecture concepts. • Ability to review remediation evidence and produce clear written validation outcomes and recommendations. • Strong stakeholder management and communication skills across technical and non-technical teams. • Strong documentation discipline: clear writing, traceable decisions, and consistent artefacts. • Comfortable working in sprint-based/agile delivery and managing multiple priorities. • Self-starter with a passion for change and transformation confident DESIREABLE • Desirable certifications: CISSP, CISM, GICSP (Global Industrial Cybersecurity Professional) or ISA/IEC 62443 • Experience supporting development of an OT Target Operating Model. • Familiarity with OT asset discovery and vulnerability scanning approaches i • Experience supporting third-party/vendor management within an OT environment. • Experience contributing to an OT risk management framework and/or maturity uplift planning