Azure PaaS Interview Questions And Answers

Platform as a Service (PaaS) questions are common in Azure interviews since many real-world applications are built on PaaS offerings like App Service, Azure Functions, and Azure SQL Database.

Common Questions and Key Talking Points

• What is PaaS, and how does it differ from IaaS? — PaaS abstracts away infrastructure management, letting developers focus on code, while IaaS requires managing the underlying VMs and OS
• What are examples of Azure PaaS services? — Azure App Service, Azure Functions, Azure SQL Database, and Azure Logic Apps
• How does Azure App Service handle scaling? — through scaling up (larger App Service Plan tiers) and scaling out (more instances), with optional autoscale rules
• What is a deployment slot in App Service? — a separate environment for staging changes before swapping them into production with minimal downtime
• How do you secure a PaaS application? — using Azure AD authentication, managed identities, network restrictions, and Key Vault for secrets

Tips for the Interview

• Be ready to explain trade-offs between PaaS and IaaS for a given scenario
• Bring concrete examples from projects where you've deployed or managed a PaaS service
• Understand pricing tiers and how they affect performance and cost