Data Quality Interview Questions

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

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These Data Quality 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.

When did you detect a mismatch?🟡 Medium · Behavioral · Asked 71×Can you tell me how you perform data reconciliation?🟡 Medium · Conceptual · Asked 22×How did you handle cases where the retrieved context was incomplete or irrelevant?🟡 Medium · Conceptual · Asked 5×How do you manage data quality?🟡 Medium · Conceptual · Asked 1×Consider a scenario where downstream analytics frequently fail due to drift and corrupt fields arriving from source databases. How would you implement automated data quality gates in AWS Glue?🔴 Hard · Conceptual · Asked 1×Describe a time when you initiated a weekly data quality review with the analytics team to catch schema drift early.🟡 Medium · Behavioral · Asked 1×Imagine the same pipeline ingesting data for a few hours, and one upstream feed starts sending bad or partially corrupted records. How would you design data quality checks and failure handling?🟡 Medium · System Design · Asked 1×Which AWS service is specifically designed for defining and enforcing data quality rules and thresholds in automated pipelines?🟢 Easy · Conceptual · Asked 1×When building a data pipeline on AWS, you notice row-bound mismatches in a downstream audit table even though the job completes successfully. How do you identify and resolve distributed processing issues in Spark, and what checks do you implement to catch dirty data?🟡 Medium · Conceptual · Asked 1×Since you haven't shared your unit testing approach yet, how do you perform integration testing in your data pipeline projects to ensure end‑to‑end data quality?🟡 Medium · Conceptual · Asked 1×How do you categorize and validate data quality within your Spark ETL workflows on Databricks?🟡 Medium · Conceptual · Asked 1×Sometimes the business reports differ from the source system. How would you investigate the mismatch? What steps or areas would you examine?🟡 Medium · Debugging · Asked 1×We have seven years of financial data, 5,500 lines, being processed. How would you ensure data quality, and considering all collateral requirements, what practices or features would you leverage to help?🟡 Medium · Conceptual · Asked 1×After performing transformation, do you check whether the destination target has all data present?🟡 Medium · Conceptual · Asked 1×The previous version of the data is gone. We have a new version of the data, but it is incorrect. We cannot give it to downstream systems or the business.🟡 Medium · Conceptual · Asked 1×I have performed data loads using full load and truncated load. During data quality checks and post‑validation checks, I analyzed and found that the data was incorrectly loaded.🟡 Medium · Conceptual · Asked 1×Let's say a data load has occurred but the data was loaded incorrectly. How would you identify and correct the issue?🟡 Medium · Debugging · Asked 1×Do you have an understanding of sensor data? How would you test the quality of sensor data to ensure there are no duplicates?🟡 Medium · Conceptual · Asked 1×Suppose we have some records that do not match the expected schema, containing null or invalid price values. How would you separate bad records to ensure only valid data is loaded for valuation?🟡 Medium · Conceptual · Asked 1×Why might data quality checks fail silently?🟡 Medium · Debugging · Asked 1×A Bronze to Silver pipeline needs data quality rules that drop invalid rows yet record metrics for monitoring. Stakeholders want declarative checks and managed lineage without hand‑coding UDF logic. What should you choose?🟡 Medium · Conceptual · Asked 1×A Bronze-to-Silver pipeline requires data quality rules that drop invalid rows while recording metrics for monitoring. Stakeholders want declarative checks and managed lineage without hand‑coding UDF logic. Which option should you choose?🟡 Medium · Conceptual · Asked 1×We have three successful records. If we ignore one sent record, will the total count be four?🟡 Medium · Conceptual · Asked 1×Assume a pipeline suddenly processes duplicate records for two days. How would you detect and fix this issue? What approach would you take?🟡 Medium · Conceptual · Asked 1×

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