Data Validation Interview Questions

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

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These Data Validation 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.

There is also a data engineering part to this. For example, developing a data pipeline for ground truth. How would you go about this?🟡 Medium · Conceptual · Asked 1×Since you haven't yet shared details on re‑engineering business logic, can you explain your process for validating data in TaaS and performance after migrating legacy pipelines to Databricks?🟡 Medium · Conceptual · Asked 1×You describe mapping workflows and validating outputs at each stage. How do you re‑evaluate them?🟡 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×Let's say we are receiving some special characters in the header part of a file. How would you mitigate or handle this scenario?🟡 Medium · Conceptual · 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×Why do we need to go back to CDC for mapping validation when we already have millions of records and are validating them in the raw zone?🟡 Medium · Conceptual · Asked 1×Why do we need to go back to CDC for automated test cases when we already have curated data loaded into the curated zone?🟡 Medium · Conceptual · Asked 1×We already have a dataset that we want to validate against the source and target. Why are we reading it again using change data capture?🟡 Medium · Conceptual · Asked 1×How would you find missing records in a new system, find mismatched records (amount, date, etc.), and perform row count comparison by day?🟡 Medium · Conceptual · Asked 1×These are two tables: all_system_orders and new_system_orders. Data has been transferred; how would you validate that the data has been correctly imported? Write queries to validate the data.🟡 Medium · Coding · Asked 1×Given scenarios, write queries to validate data.🟡 Medium · Coding · Asked 1×Will the first record be accepted because it has the same center ID and receiver ID?🟢 Easy · Conceptual · Asked 1×

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