What is AWS Lambda?

0-2 years experience

1. 1How would you set up a Lambda function to process images uploaded to an S3 bucket?
2. 2What happens if the Lambda execution time exceeds the configured timeout?
3. 3Can you explain how you would pass environment variables to a Lambda function?

2-5 years experience

1. 1We have a Lambda that reads from DynamoDB and writes to SQS, but it's failing intermittently. How would you troubleshoot the issue?
2. 2When choosing between Lambda and an EC2 instance for a periodic batch job, what trade‑offs would you consider?
3. 3Explain why a cold start might affect latency and how you could mitigate it for a latency‑sensitive API.

5-8 years experience

1. 1Design a serverless data pipeline that ingests clickstream events, transforms them, and stores them in Redshift using Lambda. What scaling and error‑handling concerns would you address?
2. 2How would you handle versioning and rollback of Lambda functions in a CI/CD pipeline for a high‑traffic service?
3. 3Discuss the impact of Lambda concurrency limits on a traffic spike and how you would configure provisioned concurrency.

8+ years experience

1. 1Our organization is migrating a monolithic order‑processing service to a serverless architecture using Lambda, Step Functions, and EventBridge. What architectural considerations and cross‑team coordination would you prioritize to ensure reliability and observability?
2. 2When multiple teams share a common Lambda layer, how do you manage dependency conflicts and long‑term maintenance?
3. 3If you need to keep a Lambda‑based system compliant with strict data residency regulations, what design decisions and tooling would you put in place?