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Planning a 200-application cloud migration without disruption

A retailer used a prioritised migration roadmap to move its estate to the cloud in waves.

40%
infrastructure cost reduction, with 3x faster deployments

At a glance

Client
A multi-format retail chainName withheld for confidentiality
Focus area
Cloud Migration
Service
Consulting
Scope
Application assessment, migration strategy and wave planning

The challenge

The retailer ran around 200 applications in its own data centres, from store systems to warehouse and finance tools. Hardware was ageing and costly, but nobody knew which systems could move safely or in what order.

Any outage during trading hours or the festive season would directly hit revenue.

Our approach

  1. Assess every application

    We scored each application on business value, complexity, dependencies and cloud readiness.

  2. Choose a path for each

    Applications were marked to rehost, re-platform, rebuild, replace or retire.

  3. Plan migration waves

    Moves were grouped into waves around trading calendars, starting with low-risk systems.

  4. Build the landing zone

    A secure, well-governed cloud foundation was in place before the first wave moved.

The solution

The retailer now has a clear, sequenced roadmap for its whole estate, with early waves building confidence and freeing budget for later ones. Applications that no longer earned their keep were retired rather than migrated.

Teams release changes faster on the cloud platform, and infrastructure costs follow actual usage.

Results

40%
infrastructure cost reduction, with 3x faster deployments
  • Every application assessed and assigned a migration path
  • Waves scheduled around trading calendars
  • Unused applications retired instead of moved
  • Secure cloud foundation ready before migration

Technology used

  • Cloud adoption framework
  • Application portfolio analysis
  • AWS / Azure landing zones
  • Cost modelling

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