IT System Architect

Job description Randstad Digital are seeking a seasoned, hands-on Senior IT Technical Lead to drive a separation delivery for core IT Foundation tracks within a high-profile business carve-out programme. The assignment starts asap and lasts until June 2027. with a possible prolongation. This assignment spans three critical areas: Identity & Collaboration, Network & Infrastructure, and Service Desk / Site & Facility IT. The guiding objective is to ensure business continuity, avoid unnecessary transformation or redesign, and deliver pragmatic, robust technical solutions to hit critical separation milestones. Please note: This is a hands-on technical ownership and delivery role, not a coordination or PM layer. You will be expected to dive deep into architectures, solve complex problems with engineering teams and vendors, and take definitive technical ownership. Responsibilities Technical Ownership: Own unresolved, cross-domain technical challenges through to resolution alongside internal engineers, service owners, and third-party suppliers. Roadmaps & Solution Design: Translate high-level separation requirements into actionable roadmaps and technical designs across identity, collaboration, infrastructure, and site services. M365 & Identity Architecture: Lead and challenge solution designs regarding Microsoft 365, tenant-to-tenant migration, coexistence, and identity separation. Pragmatic Scope Control: Determine exactly what must change at each milestone versus what can be safely retained or deferred. Cutover & Contingency: Design, validate, and sign off on technical readiness for migrations, cutovers, fallback plans, and service continuity. Risk & Long-Lead Execution: Proactively trigger long-lead technical actions early and escalate material architecture, security, or dependency risks to programme leadership. Qualifications Technical Capabilities Carve-Out / Separation Expertise: Proven, hands-on experience delivering complex IT separations, corporate carve-outs, or large-scale M&A divestment programmes. Microsoft 365 Architecture: Deep, verifiable expertise across Exchange Online, Teams, SharePoint Online, and OneDrive. Identity & Security: Extensive experience with Microsoft Entra ID (Azure AD), on-premises Active Directory, authentication protocols, access controls, and Microsoft compliance/security toolsets. Tenant Migration & Coexistence: Documented track record executing M365 tenant-to-tenant separations, cross-tenant migrations, and multi-tenant coexistence architectures. Core Infrastructure: Broad working knowledge of enterprise networking, hybrid hosting, enterprise ITSM/Service Desk transitions, and multi-site IT cutovers. Personal Qualities Hands-on Technical Authority: Commands respect from engineers, architects, and external vendors through deep technical competence rather than organizational hierarchy. Outcome-Oriented & Accountable: Proactive problem solver who dives straight into technical ambiguity and drives issues across the finish line. Low Ego, High Impact: Pragmatic, humble, and collaborative. Fosters psychological safety, values peer input, and navigates high-stakes change with clarity and positive energy. About the company Randstad På Randstad vet vi att alla människor har en plats på arbetsmarknaden. Med verksamhet över hela landet och inom alla kompetensområden hjälper vi människor att hitta ett jobb som känns bra, och där de får möjlighet att växa, utvecklas och uppnå sin fulla potential. Med närmare 600 000 anställda i 38 länder är Randstad världsledande inom HR-tjänster, med målsättningen att bli världens främsta och mest uppskattade partner på arbetsmarknaden. Genom att kombinera vår passion för människor med kraften i dagens teknologi hjälper vi människor och företag att uppnå deras fulla potential. Vi kallar det Human Forward.