Enterprise Arch. Strategic Advisor

Req ID: 385540 

NTT DATA strives to hire exceptional, innovative and passionate individuals who want to grow with us. If you want to be part of an inclusive, adaptable, and forward-thinking organization, apply now.

We are currently seeking a Enterprise Arch. Strategic Advisor to join our team in London, London, City of (GB-LND), United Kingdom (GB).

Discovery & Assessment Phase 
• Lead Discovery & Assessment activities: review current KC environment findings, validate assumptions, identify technical risks and dependencies
• Define planning assumptions baseline with Project Manager: user population, device counts, data volumes, network constraints, manufacturing site blackouts
• Establish 10% variance threshold (DEP-02): confirm with KC that Discovery findings align within ±10% of SOW assumptions, or invoke Change Control Process
• Own technical component of D-01 (Discovery & Assessment Report): architecture assessment, dependency mapping, risk register, technical readiness summary
Design & Architecture Phase 
• Lead target-state architecture design across all domains: Entra ID, Exchange Online coexistence, Intune/endpoint management, SharePoint/OneDrive, Teams, security baselines (CIS L1)
• Own D-02 (Target State Architecture Design): overall architect sign-off, component integration, rollback strategy, coexistence mail flow and domain lifecycle approach
• Design Day 1.5 cutover approach: bulk UPN + SMTP flip, domain tenancy handover sequence, failure modes, rollback procedures at batch level
• Approve all runbooks (D-03) before Design phase closure: identity, endpoint, device, application deployment, rollback procedures
• Establish migration throughput baseline (D-01 input) with Automation Engineer: define acceptable users/day per wave, buffer assumptions, monitoring thresholds
Pilot Migration Phase
• Oversee Pilot Migration execution: 1,000-user validation cohort
• Approve Pilot entry/exit criteria with all architects and specialists
• Sign-off on Pilot Migration Report (D-05): validate address rewrite POC, identity cutover, mail flow, device transition, Teams/SharePoint/OneDrive functionality
• Prepare Stage 2 Readiness Gate (MS-03) evidence pack with Migration Architects: architecture validation, runbook approval, Go/No-Go recommendation, risk mitigation status
• Make Go/No-Go decision for Stage 2 commencement (MS-03, 05 Nov 2026): sign design authority approval or escalate blockers to Delivery Principal
Migration Execution Phase 
• Serve as design authority through all migration waves: approve wave sequencing, batch definitions, readiness gates
• Oversee Day 1.5 cutover execution (30-hour window): provide technical decision authority, escalation point for cutover blockers, post-cutover stabilisation oversight
• Escalation point for all Sev1 (critical) defects: diagnose root causes, approve remediation approaches, validate fixes before wave progression
• Wave-by-wave technical sign-off: review D-06 (Wave Completion Reports) for technical quality, success rates, defect resolution status, readiness for next wave
• Monitor migration performance against baseline: escalate throughput variances, network bottlenecks, or infrastructure constraints to Project Manager
• Lead wave readiness reviews with all specialists: ensure all components ready (identity, endpoint, collaboration, support infrastructure)
Hypercare & Closure Phase
• Provide technical leadership during hypercare stabilisation period (19 Nov 2026 – 03 Apr 2027)
• Escalation point for complex post-migration issues: Sev1 technical blockers that Service Desk cannot resolve
• Approve technical remediation approaches for systemic issues identified post-cutover
• Validate compliance and data integrity post-migration: retention architecture execution, sensitivity label alignment, eDiscovery case continuity (DEP-18)
• Oversee source tenant decommission planning: strategy for KC tenant closure, data retention, compliance holds
• Lead preparation of D-10 (Programme Closure Report): technical summary, lessons learned, architecture handoff documentation
• Knowledge transfer to KC operations: document target-state architecture, ongoing support model, escalation procedures for post-migration issues
Programme Technical Governance (All Phases)
• Attend all Steering Committee meetings: present technical status, escalate architecture risks, confirm readiness for phase transitions
• Maintain technical risk register: identify design risks, mitigation strategies, residual risk acceptance by KC leadership
• Approve all architectural decisions made by Migration Architects and specialists: ensure design consistency and alignment with target-state
• Mentor delivery team: coach Migration Architects 1 & 2, provide technical guidance to specialists, support problem-solving on complex issues
• Champion technical excellence: establish quality standards, review deliverables (D-02, D-03, D-05, D-06), ensure design documentation completeness
Stakeholder & Executive Communication
• Present technical status to KC leadership at Steering Committee (periodic, as required)
• Provide executive summaries of technical risks and mitigation status
• Clarify technical assumptions and design decisions to KC stakeholders
• Approve technical content in programme repor

About NTT DATA

NTT DATA is a $30 billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world's leading AI and digital infrastructure providers, with unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers and application services. our consulting and Industry solutions help organizations and society move confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more than 50 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start-up partners. NTT DATA is a part of NTT Group, which invests over $3 billion each year in R&D.

Whenever possible, we hire locally to NTT DATA offices or client sites. This ensures we can provide timely and effective support tailored to each client’s needs. While many positions offer remote or hybrid work options, these arrangements are subject to change based on client requirements. For employees near an NTT DATA office or client site, in-office attendance may be required for meetings or events, depending on business needs. At NTT DATA, we are committed to staying flexible and meeting the evolving needs of both our clients and employees. NTT DATA recruiters will never ask for payment or banking information and will only use @nttdata.com, @nttdatafed.com and @talent.nttdataservices.com email addresses. If you are requested to provide payment or disclose banking information, please submit a contact us form, https://us.nttdata.com/en/contact-us.

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