We are seeking a Senior / Enterprise Architect to provide architectural leadership for the Transformation Program, which is delivering a modern digital platform to replace the legacy Drupal-based Portal with ServiceNow integrated with Entrust CIAM. This role is critical as the program approaches its first releases and continues into further delivery phases, providing cross-cutting architectural leadership across CIAM, security and integrations. Responsibilities Lead and govern architectural decisions across the program, ensuring alignment with strategic objectives Ownership of architecture across CIAM, security and integrations, working alongside ServiceNow architects responsible for platform design Definition and validation of end-to-end architecture, ensuring scalability, security and alignment across environments Oversight of the CIAM solution (Entrust), including migration from Ping, authentication/authorisation models and integration with ServiceNow and other systems Ensure robust integration patterns, API design and data migration strategy Drive compliance with security standards (e.g., GDPR, NCSC CAF, NIST) and lead threat modeling activities Support governance processes (e.g., ARB/TAB) and act as an escalation point for architectural risks Collaboration with technical and non-technical stakeholders across client, vendors and delivery teams Requirements Expertise in identity-centric architecture and CIAM (OAuth2, OpenID Connect, SCIM, MFA, passwordless) Understanding of security architecture, threat modeling (STRIDE, MITRE ATT&CK) and cloud security models Skills in API and integration design across cloud and legacy systems Knowledge of data migration, encryption and data integrity principles Background in public sector governance and security standards (NCSC CAF, NIST, Secure by Design) Proven experience in large-scale migration/transformation programs Competency in stakeholder management and communication English proficiency at B2 level or higher Nice to have Familiarity with Entrust IDaaS Knowledge of PingFederate