Why architecture matters here

Migration playbook fails when it lacks rollback + retros. Architecture matters because process + comms + rollback compose.

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The architecture: every piece explained

The top strip is planning. Assessment. Migration plan. Strangler façade. Data migration.

The middle row is execution. Testing. Cutover. Rollback plan. Comms.

The lower rows are learning. Retrospectives. Metrics. Ops — freeze + escalation.

Migration playbook — assess + strangler + cutover + rollback + retrosthe process that gets migrations acrossAssessmentinventory + risk + scopeMigration planwaves + ownersStrangler façaderoute old / newData migrationdual write + backfillTestingshadow + canaryCutoverflip trafficRollback planreverse switchCommsstakeholdersRetrospectiveslearn each waveMetricsprogress + riskOps — freeze + escalation + fundingshadowflipreverseinformlearntracktrackoperateoperate
Migration playbook from assessment to retros.
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End-to-end flow

End-to-end: wave 1 — assess + plan. Wave 2 — strangler façade lives beside old system. Wave 3 — dual writes tested. Cutover in staged canary. Rollback available. Retrospective informs next wave.