Enterprise Security Architect - Inside IR35 - SC Cleared

Enterprise Security Architect Inside IR35: £550 - £600 Hybrid: 2 days a week in London / Bristol Active SC Clearance required We're looking for an SC Cleared Enterprise Security Architect to support a major secure telecoms programme across mobile network, enterprise IT and cloud environments. You'll help define and maintain security architecture across 4G/5G core, RAN, OSS/BSS, AWS, SDN/NFV, Open RAN, edge computing and cloud migration workstreams, ensuring designs are secure, compliant and aligned to programme objectives. Key Responsibilities Define and maintain enterprise security architecture across telecoms and enterprise IT systems Develop target-state security architectures aligned to business, regulatory and operational requirements Apply TOGAF, SABSA and ArchiMate across architecture artefacts and governance Design secure AWS, hybrid and cloud-native architectures Conduct threat modelling, risk assessments and security design reviews Define security patterns, standards and reference architectures Support assurance, governance, audit and secure-by-design delivery Collaborate with engineering, operations, risk, compliance and vendor teams Essential Experience Enterprise Security Architecture experience within telecoms, mobile networks or critical national infrastructure Strong understanding of 4G/5G core, RAN, IMS/signalling, OSS/BSS, NFV/SDN, telecom APIs and interconnect security Strong AWS cloud security architecture experience Knowledge of Zero Trust, identity security, encryption, SIEM/SOC integration and network segmentation Experience with telecoms security standards and regulations, including GSMA, NCSC, ISO 27001, NIS/NIS2 and GDPR Strong stakeholder engagement and senior-level communication skills