Aws Lambda Interview Questions

10 real Aws Lambda questions asked in live technical interviews — each with a model answer. Updated weekly.

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These Aws Lambda interview questions were captured from real interviews by candidates using Assisting AI. Each links to a full model answer. For real-time help during your own interview, get Assisting AI from ₹500/day.

How would you partition data and on what basis? If you are going to change the file size, what is partitioning? Also, from an ETL perspective, where would you run a Lambda function to process a 20GB file? Which cluster would it run on?🟡 Medium · Conceptual · Asked 1×Explain blue/green deployment with traffic shifting in AWS Lambda.🟡 Medium · Conceptual · Asked 1×Do you have any exposure to AWS services such as Lambda, API Gateway, CloudWatch, and DynamoDB?🟢 Easy · Conceptual · Asked 1×Explain job orchestration. In job orchestration, there are various methods such as Airflow, Glue, Lambda, Step Functions, etc. Can you explain when you would use each?🟡 Medium · Conceptual · Asked 1×We process a large amount of data daily, receiving files every second or minute. We currently move files to another folder or bucket. Is there an optimized solution for this file transfer?🟡 Medium · Conceptual · Asked 1×When a file is uploaded, an event triggers a second function. How can we design this event‑driven flow in AWS?🟢 Easy · Conceptual · Asked 1×How does the bridge between the raw S3 bucket and the first Lambda function work, and how is the second Lambda function triggered by an event?🟡 Medium · Conceptual · Asked 1×If a Lambda function hasn't been scheduled yet, how does it become the first to execute, and what bridges the functions together?🟡 Medium · Conceptual · Asked 1×I created a Lambda function that calls another Lambda function and added some Python libraries. When I try to import those libraries, some are not available. How can I resolve this?🟡 Medium · Debugging · Asked 1×Is it a cold start?🟢 Easy · Conceptual · Asked 1×

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