Enterprise Security Architect - Long-termInside IR35: 550 - 600Hybrid: 2 days a week in London / BristolActive SC Clearance requiredWe''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 ResponsibilitiesDefine and maintain enterprise security architecture across telecoms and enterprise IT systemsDevelop target-state security architectures aligned to business, regulatory and operational requirementsApply TOGAF, SABSA and ArchiMate across architecture artefacts and governanceDesign secure AWS, hybrid and cloud-native architecturesConduct threat modelling, risk assessments and security design reviewsDefine security patterns, standards and reference architecturesSupport assurance, governance, audit and secure-by-design deliveryCollaborate with engineering, operations, risk, compliance and vendor teamsEssential ExperienceEnterprise Security Architecture experience within telecoms, mobile networks or critical national infrastructureStrong understanding of 4G/5G core, RAN, IMS/signalling, OSS/BSS, NFV/SDN, telecom APIs and interconnect securityStrong AWS cloud security architecture experienceKnowledge of Zero Trust, identity security, en