Top 48 Serverless Architecture Interview Questions & Answers (2026)

01 What is serverless architecture? 02 What is a Function as a Service (FaaS)? 03 What are common serverless providers? 04 What is AWS Lambda? 05 What is cold start in serverless? 06 What triggers can invoke a serverless function? 07 What is the difference between serverless and traditional server hosting? 08 What is the billing model for serverless functions? 09 What is the maximum execution timeout for AWS Lambda? 10 What is the difference between serverless and containers? 11 What is Backend as a Service (BaaS)? 12 What are the benefits of serverless architecture? 13 What are the limitations of serverless architecture? 14 What is a serverless framework? 15 What is an API Gateway? 16 What is the role of environment variables in serverless functions? 17 What is event-driven architecture and how does it relate to serverless? 18 What is the difference between AWS Lambda and Google Cloud Functions? 19 What is a deployment package in serverless? 20 What is Infrastructure as Code (IaC) in the context of serverless?

01 How do you reduce cold start latency in serverless functions? 02 What is AWS Step Functions and when would you use it? 03 How do you handle state in serverless applications? 04 What is the Serverless Framework and how does it work? 05 How do you implement authentication in a serverless API? 06 What is Lambda@Edge and what are its use cases? 07 How do you implement a CRON job with serverless functions? 08 How do you handle database connections in serverless functions? 09 What is a Dead Letter Queue (DLQ) in serverless? 10 How do you implement microservices with serverless? 11 What is AWS SAM (Serverless Application Model)? 12 How do you monitor and debug serverless functions? 13 What is the difference between synchronous and asynchronous Lambda invocations? 14 How do you manage secrets in serverless applications? 15 What is provisioned concurrency in AWS Lambda? 16 How do you handle errors and retries in serverless functions? 17 What is the event source mapping in AWS Lambda? 18 What are the security considerations for serverless applications?

01 How do you architect a multi-region serverless application? 02 What are the trade-offs between serverless and Kubernetes? 03 How do you implement event sourcing with serverless? 04 What is CQRS and how does it apply to serverless architectures? 05 How do you handle distributed transactions in serverless? 06 What is the strangler fig pattern and how does it apply to serverless migration? 07 How do you implement blue-green deployments with serverless? 08 What are the observability challenges unique to serverless architectures? 09 How do you design for idempotency in serverless functions? 10 What is the future of serverless architecture?