Integration Engineer (NPPV3)HR and Duties Replacement Programme EnhancementLocation: Warwickshire (Hybrid) Contract: Initial contract through December 2026 Rate: 550 - 600 per day INSIDE IR35 Active NPPV3 RequiredOverviewOur client is delivering a major transformation programme to replace existing HR and Duties capability (Origin) with a new strategic workforce management platform comprising Oracle Fusion and Crown DMS. The new solution will become the system of record for workforce, organisational, and employee data.We are seeking an experienced Interface Engineer to take ownership of the integration workstream, providing technical leadership across interface architecture, design assurance, implementation, testing and deployment activities.Essential Skills and ExperienceNPPV3 ClearanceProven experience as an Interface Engineer, Integration Engineer, or similar integration-focused role.Strong background designing and implementing enterprise-scale integrations.Experience delivering API-led integration''s and middleware-based solutions.Experience delivering integration solutions across complex business-critical environments.Ability to review and challenge third-party technical designs.Strong stakeholder engagement and supplier management experience.Excellent documentation and communication skills.Experience supporting testing, deployment, and operational readiness activities. With knowledge of:REST APIsWeb ServicesFile-based integrationsETL/data transformation ..... full job details .....