STEP 1 · ASSESSNorthwind
1,200 applications, six decisions.
WHAT WE DECIDED FOR EACH APP · TYPICAL BANK ESTATE
Rehost34%
Replatform22%
Refactor14%
Repurchase9%
Retire13%
Retain8%
13% retired before anything moves. That alone pays for the assessment.
CLOUD MIGRATION · THE METHOD02 / 03
STEPS 2–3 · SLICE AND MOVENorthwind
Moved in waves, never all at once.
Q1Q2Q3Q4
Wave 1 · Low risk180 apps
Wave 2 · Customer-facing420 apps
Wave 3 · Core systems310 apps
Decommission data centre
Rollback
Every wave can reverse in 4 hours
Freeze
No moves in month-end close
Rehearse
Each wave run twice first
140 MIGRATIONS · ZERO UNPLANNED DOWNTIME03 / 03