IntermediateBEHAVIORAL
Describe a time when you led the migration of an existing on‑premises or legacy application to the cloud. How did you assess what to rehost, refactor, or replace, and how did you handle dependencies such as databases, identity/SSO, and networking during the migration?
Cloud Architect
General

Sample Answer

I led the migration of a legacy .NET monolith from a data center to Azure for a SaaS product used by about 4,000 enterprise users. We started with an app and dependency assessment: code complexity, coupling, tech stack, and release cadence. About 60% of the workload was a good fit to rehost into Azure VMs behind an Azure Application Gateway to hit a tight 6‑month deadline. High‑ROI components like reporting and file processing were carved out and refactored into Azure App Service and Functions. We moved SQL Server to Azure SQL Managed Instance to keep compatibility, and used Azure AD for SSO, federated with the clients’ IdPs. Networking was done with a hub‑and‑spoke model, site‑to‑site VPN, and later ExpressRoute. We ran dual‑write for two weeks, then cut over traffic gradually by region. Downtime during final cutover was under 15 minutes, and infra costs dropped ~25% over the first year.

Keywords

Clear migration strategy: mix of rehost and targeted refactorStructured assessment of applications and dependenciesHandling of databases, identity/SSO, and hybrid networkingMeasured impact: low downtime and ~25% cost reduction
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