IaaS vs PaaS for first cloud migration
WHAT IT TESTS: matching a service model to team maturity. OUTLINE: IaaS (lift-and-shift) gives control with high ops overhead; PaaS lowers ops but may need refactoring; for a monolith with limited expertise, IaaS lift-and-shift is the lower-risk first step.
WHAT IT TESTS: whether you can match a cloud service model to the team's situation rather than reciting definitions. ANSWER OUTLINE: IaaS gives maximum control and the easiest lift-and-shift of an existing monolith, but you still manage OS, patching, and scaling. PaaS removes much operational overhead and speeds development but often requires re-architecting the app to fit the platform. For a monolith team with limited cloud skills, recommend IaaS lift-and-shift first as the lower-risk, faster initial move, then modernize toward PaaS later.
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