Salary: £21,000 - 25,500 per year Requirements: Active, current Developed Vetting (DV) clearance Proven background in OT architecture within a defence, CNI, or regulated industrial environment Strong familiarity with IEC 62443, NIST SP 800-82, and/or equivalent OT security frameworks Experience with SCADA, ICS, PLC, or embedded/real-time systems architecture Solid understanding of OT/IT convergence, network segmentation, and secure system design Comfortable operating within formal systems engineering environments (e.g. MBSE, DODAF, NAF) Ability to communicate complex architectural concepts to both technical and non-technical audiences Experience in safety-critical or high-integrity systems is highly desirable Responsibilities: Designing and owning end-to-end OT architecture across complex, multi-domain systems Developing reference architectures, patterns, and standards aligned to programme requirements Leading OT/IT boundary definition and network segmentation design (Purdue model / IEC 62443) Providing architectural assurance and technical governance across the programme Engaging with cross-functional engineering, security, and programme leadership teams Driving OT cyber security strategy and NCSC-aligned secure-by-design principles Supporting DRACAS, configuration management, and architecture change control processes Interfacing with MOD stakeholders and contributing to technical reviews and audits Technologies: Embedded Network PLC Security Architect More: We are a globally recognised prime defence contractor working on a critical, long-running programme based in Preston, Lancashire. In this technically demanding role, you will be embedded within a complex, highly secure programme environment that supports some of the UKs most sensitive national infrastructure. We offer a dynamic work environment with opportunities to lead significant architectural designs and contribute to national security initiatives. last updated 10 week of 2026