IntermediateBEHAVIORAL
Think about a time you led or significantly contributed to a migration from on‑premises (or a legacy hosting environment) to the cloud. Walk me through how you assessed the existing workloads, chose between rehost/refactor/replatform, and managed risks around downtime and data integrity.
Cloud Architect
General

Sample Answer

I led a migration of about 120 on‑prem VMs from two data centers to Azure for a logistics company. We started with a 6-week assessment: dependency mapping with tooling plus interviews with app owners. That gave us three buckets: 60% rehost, 25% replatform, 15% refactor. The core ERP system was rehosted first using Azure Migrate and ASR for near-zero downtime cutover; we ran in sync for 48 hours with real-time replication and switched over during a 2-hour maintenance window. For customer-facing apps, we replatformed to App Service and Azure SQL to offload patching, then gradually refactored the highest-traffic API into containers. To manage risk, we used blue/green DNS cutovers, enforced read-only modes during final data syncs where needed, and pre-built rollback plans for every wave. Across the entire program, we had no unplanned downtime and cut infrastructure costs by ~28% within the first year.

Keywords

Structured discovery phase using tooling plus stakeholder interviewsClear criteria for rehost vs replatform vs refactor per applicationUse of replication, blue/green cutover, and read-only modes to protect data and uptimeMeasured business impact: zero unplanned downtime and ~28% cost reduction
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