Scattered layers: Twelve regional PostgreSQL instances, three legacy SQL Server databases and an undocumented MongoDB collection serving patient scheduling across 40 NHS trust sites.
Pass method: Channel split audit, unified schema design with read-replica overlap zones, incremental migration passes with proof-state validation at each trust deployment.
Clear impression: Single governed data layer with sub-200ms query response across all sites, full GDPR audit trail and 99.97% uptime since go-live.
Scattered layers: On-premise Oracle RAC cluster, manual backup scripts and a fragmented .NET monolith with 200+ undocumented stored procedures.
Pass method: Azure SQL Managed Instance migration with controlled overlap between legacy and cloud channels during a six-month parallel-run period.
Clear impression: 40% infrastructure cost reduction, automated disaster recovery with 15-minute RPO and FCA-compliant data residency.
Scattered layers: 34 internal REST endpoints with inconsistent authentication, three SOAP legacy integrations and no API versioning strategy.
Pass method: API gateway deployment, OAuth 2.0 standardisation, GraphQL federation layer for partner-facing channels.
Clear impression: Unified API portal with 99.9% SLA, developer documentation and 60% reduction in integration onboarding time.
Scattered layers: Siloed sales data across 12 regional databases, manual Excel reporting and no real-time inventory visibility.
Pass method: Snowflake data warehouse, dbt transformation layers, Power BI dashboard suite with automated daily proof-state checks.
Clear impression: Real-time sales analytics across 200+ stores, automated stock alerts and board-ready reporting within 4 hours of close.
Scattered layers: Legacy student information system, paper-based enrolment workflows and disconnected finance and HR databases.
Pass method: Custom .NET platform with PostgreSQL backend, microservice architecture and phased module rollout across three academic years.
Clear impression: Unified student lifecycle platform serving 15,000 students with online enrolment, automated fee calculation and integrated reporting.
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