Data Lake Interview Questions

12 real Data Lake questions asked in live technical interviews — each with a model answer. Updated weekly.

🎤 Auto-captured by Assisting AI during live interviews

These Data Lake 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.

Where does raw data reside before it becomes usable?🟢 Easy · Conceptual · Asked 1×What kind of data do you store in the gold layer of a data lake?🟡 Medium · Conceptual · Asked 1×What is the difference between the bronze, silver, and gold layers in a data lake architecture, and how do you handle data once it reaches the silver layer? Also, how do you consolidate multiple data sources into a single table?🟡 Medium · Conceptual · Asked 1×Can you describe your data architecture, specifically how you transition data from the silver layer to the gold layer?🟡 Medium · Conceptual · Asked 1×Describe the key functionalities of your data pipeline: the source system, the ingestion mechanism you use to bring data into cloud storage, the transformations and cleansing performed in the silver layer, the aggregation performed in the gold layer, and the consumers or users that consume the data. What is the business use case?🔴 Hard · Conceptual · Asked 1×What is the Medallion Architecture, and can you explain your experience with it and the purpose it serves?🟡 Medium · Conceptual · Asked 1×Do you know what Delta Lake is and what it does?🟡 Medium · Conceptual · Asked 1×What is Delta Lake in Databricks, and what are its main components?🟡 Medium · Conceptual · Asked 1×Source data is in the bronze layer. We need to implement SCD type 2 in the target layer. If data arrives daily in batch and the bronze layer is refreshed each day, what logic would you use between the bronze and target layers to achieve SCD type 2?🟡 Medium · Conceptual · Asked 1×Which tools could you use for bringing all data out of a data lake?🟡 Medium · Conceptual · Asked 1×What type of resource were you using to transform raw files from bronze to silver to gold layers?🟡 Medium · Conceptual · Asked 1×What is the major difference between a data lake and a data warehouse?🟢 Easy · Conceptual · Asked 1×

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