This is a rare opportunity to take ownership of cyber security architecture at national scale, sitting at the heart of a programme with real national significance. Backed by substantial government investment, our client is developing a world-first resilient infrastructure capability designed to protect the critical services that modern society depends on, including telecommunications, banking, transport and emergency response. As Principal Security Architect, you will serve as Security Pillar Lead across a portfolio of complex programmes, shaping strategy, leading assurance, and ensuring that the technology underpinning essential national services is built to remain secure and robust under any conditions. Key Responsibilities: Lead the cyber security architecture and design function across a portfolio of the programmes, including the technical design of systems and services at an organisational and inter-organisational level, delivering at national scale. Oversee the design, delivery and running of cyber operational capability, developing an enterprise architecture aligned with guiding principles and organisational risk appetite. Research, identify, validate and adopt new security technology, architecture and methodology. Lead engagement with customers across UK Government and the private sector on security risk and decision-making. Communicate current and emerging threats, whilst designing security architecture to mitigate against them. We are looking for a senior cyber ..... full job details .....