SC Cleared Security Architect

SC Cleared Security Architect/Outside IR35/Remote (Occasional travel to client site)/12 Month ContractOur client is seeking an experienced Security Architect to support a major infrastructure exit and transition programme involving the migration of services from multiple incumbent suppliers to a new strategic provider.This is a high-profile engagement requiring a technically strong Security Architect who can provide independent security assurance across complex hosting, cloud and platform environments while ensuring risks are managed throughout transition and service acceptance activities. The programme spans hosting, storage, cloud services, platform services and data centre exit activities. Key ResponsibilitiesProvide security leadership across a large-scale supplier transition and service migration programme.Review and assure security architecture covering cloud, infrastructure, networks, identity, hosting and operational security controls.Assess migration designs, HLDs, LLDs, cutover plans and service acceptance criteria.Conduct security risk assessments and threat modelling activities.Support programme governance by providing clear security recommendations and risk-based decision support.Work closely with client teams, incumbent suppliers and incoming service providers to ensure security requirements are maintained throughout the transition life cycle.Support readiness reviews, go/no-go decisions and service acceptance activities.Assure secure decommissioning, data ..... full job details .....