Data Quality Interview Questions

15 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.

What are the key dimensions of data quality and how do you ensure them in a data pipeline?🟡 Medium · Conceptual · Asked 2×Given a table with columns ID, student, name, and email, how would you handle duplicate names?🟡 Medium · Conceptual · Asked 1×What approach would you take to avoid duplicate records in a data pipeline, both before and after transformation?🟡 Medium · Conceptual · Asked 1×In 2017, RIPP presented millions of metadata records, and the application was consuming a lot of data. How did you identify and resolve data quality issues in that scenario?🟡 Medium · Conceptual · Asked 1×How do you verify that a daily data refresh has completed successfully and that the resulting numbers are accurate?🟡 Medium · Conceptual · Asked 1×If a day's data is loaded twice, how do you detect it and fix it? Additionally, if something was wrong in yesterday's data and you need to reload a month of data, what do you do?🟡 Medium · Debugging · Asked 1×If a day's data is loaded twice, how do you detect it and fix it?🟡 Medium · Debugging · Asked 1×What did you do when a batch load introduced bad rows?🟡 Medium · Conceptual · Asked 1×Which AWS service is specifically designed for defining and enforcing data quality rules and thresholds in automated pipelines?🟢 Easy · Conceptual · 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×How would you approach synchronizing client data that arrives as Excel files and may not match your schema, ensuring data quality and ease of use?🟡 Medium · Conceptual · Asked 1×What are the challenges of data entry when keeping up with all fields?🟢 Easy · Conceptual · Asked 1×Can you describe a project where you had to ingest advertising data from multiple platforms (e.g., TM360, DB360, TradeDesk) and handle data quality issues in custom offline data?🟡 Medium · Behavioral · Asked 1×Did you implement data validation and quality checks?🟢 Easy · Behavioral · 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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