S3 Interview Questions

13 real S3 questions asked in live technical interviews — each with a model answer. Updated weekly.

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These S3 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.

What kind of storage classes have you used?🟢 Easy · Conceptual · Asked 1×You load data into Snowflake or de‑bucket from S3. What kind of processing do you do using PySpark?🟡 Medium · Conceptual · Asked 1×After processing data from your source, you store it in three S3 buckets and then write it back to another S3 layer. Who uses this data and how do they use it?🟡 Medium · Conceptual · Asked 1×If data is stored in S3 and processed to another place, how do downstream systems consume it?🟡 Medium · Conceptual · Asked 1×Explain how to deploy a single‑page application (Angular or React) on CloudFront with static files stored in S3, including certificate management, and how to set up the backend using Lambda functions for each UI route.🟡 Medium · Conceptual · Asked 1×How do you ingest data into S3 from multiple systems such as Snowflake, ServiceNow, Salesforce, and ERP, and have you built any integration to pull data from Salesforce?🟡 Medium · Conceptual · Asked 1×In your project, you bring JSON data, run a cron job, and load it into S3. What transformations do you perform, and what difficulties do you face in this flow?🟡 Medium · Conceptual · Asked 1×How do you build an ETL pipeline that transforms data, stores it in Amazon S3, and queries it using Amazon Athena?🟡 Medium · Conceptual · Asked 1×Write a Python script to list all objects in a given S3 bucket and log their names. Include basic error handling for cases such as missing buckets or incorrect permissions.🟢 Easy · Coding · Asked 1×In a previous design, a view was built to directly query data from S3, causing slowdown. How did you address this performance issue?🟡 Medium · Debugging · Asked 1×How would you design an AWS Glue job to process data flowing through multiple S3 buckets in a banking domain, when historical data storage is not required?🟡 Medium · Conceptual · Asked 1×Explain the different techniques for moving data from S3 to Redshift.🟡 Medium · Conceptual · Asked 1×How do you onboard data from S3 into Snowflake?🟡 Medium · Conceptual · Asked 1×

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