Data Pipeline Interview Questions

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

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What is your hands‑on experience with data pipelines?🟡 Medium · Conceptual · Asked 38×In my production job, the source schema has changed with the deletion of two columns. How would you ensure that this does not affect the production job?🟡 Medium · Conceptual · Asked 1×What is a data pipeline?🟢 Easy · Conceptual · Asked 1×How would you design a pipeline that runs whenever there is a change in the data, producing a real‑time report as soon as possible?🟡 Medium · Conceptual · Asked 1×Imagine an AWS pipeline that now has to serve an analytics team needing low-latency SQL access on curated data, while the source tables keep changing schema over time. How would you design the ingestion and transformation layer to handle schema evolution safely while keeping the SQL layer stable?🔴 Hard · System Design · 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×In a pipeline where the same source file can arrive twice downstream, how would you design the pipeline to ensure exactly one clean result is produced? What strategies would you use to handle replay and maintain idempotency?🟡 Medium · System Design · Asked 1×We send transaction data late, and sometimes the report table is already refreshed. How do you handle late‑arriving data in the reporting pipeline?🟡 Medium · Conceptual · Asked 1×Could you please explain your approach to ETL design to help me understand your experience better?🟡 Medium · Conceptual · Asked 1×Can you explain how you applied ETL design principles in your data pipeline projects to ensure reliability and efficiency?🟡 Medium · Conceptual · Asked 1×If a production data pipeline was failing for a year and two teammates disagreed on the fix, how would you handle the situation, decide the next step, and keep the team aligned while protecting delivery?🟡 Medium · Behavioral · Asked 1×I have seven years of data in a pipeline. I want to ensure data integrity, stability, and regulatory compliance. What features would you implement in a data pipeline to achieve this?🟡 Medium · Conceptual · Asked 1×Tell me about a time when you had to troubleshoot a complex issue in a production data pipeline. What tools and techniques did you use to resolve the issue?🟡 Medium · Behavioral · Asked 1×When an enhancement impacts the silver or bronze layers, how do you understand the chronology of events to determine which objects or jobs need to be monitored and adjusted when making changes to the gold or silver layers?🟡 Medium · Conceptual · Asked 1×Do you schedule end‑to‑end flows in Databricks, for example ingesting data through an API, performing cleansing and transformations all the way to the core layer? Are these runs scheduled to execute daily or at specific intervals? If failures occur, how do you receive notifications and troubleshoot the issue?🟡 Medium · Conceptual · Asked 1×What is the typical sequence of steps when building a data architecture that starts with a data lake, then processes data, and finally makes it available for BI reporting?🟡 Medium · Conceptual · Asked 1×What is the typical flow from a database to a data lake, and what is the final step in the data pipeline?🟡 Medium · Conceptual · Asked 1×Are you using a specific S3 blob storage cloud provider? Do you store information in the pipeline?🟡 Medium · Conceptual · Asked 1×In a Spark‑based pipeline built with PySpark, there are multiple compute options available. Which compute option would you prefer and why? Also, how would you parameterize the pipeline?🟡 Medium · Conceptual · Asked 1×We are talking about a Databricks pipeline. Which pipeline did you develop, and which database did you use?🟡 Medium · Conceptual · Asked 1×Which database service can be used to build a pipeline that uses native PySpark code?🟡 Medium · Conceptual · Asked 1×Have you built any pipelines in Dataplex for convenience of building pipelines?🟡 Medium · Behavioral · Asked 1×How would you implement logic for three ordered tiers (Bronze, Silver, Gold) in a target table?🟡 Medium · Conceptual · Asked 1×How do you configure a full refresh for a data pipeline?🟢 Easy · Conceptual · Asked 1×If we want to move dashboards to Tableau, how should we handle transformation logic that currently resides in Remio, and how would we adjust the ingestion pipeline to load data into the raw zone in Databricks?🟡 Medium · Conceptual · Asked 1×Can you tell me about the data pipeline you are using in your current project and your role in it?🟡 Medium · Conceptual · Asked 1×Have you designed any pipeline for processing streaming data from an implementation perspective?🟡 Medium · Behavioral · Asked 1×What are common data pipeline issues inside Change Data Capture (CDC)?🟡 Medium · Conceptual · Asked 1×How would you design a real‑time data pipeline that ingests information from millions of users into a data warehouse using Kafka and a fan‑out architecture?🔴 Hard · System Design · Asked 1×Suppose a data pipeline has retrieved 8 million records and then stopped. How would you recover to retrieve the remaining 2 million records?🔴 Hard · Debugging · Asked 1×Explain how you would design an end-to-end data pipeline using AWS Glue, from S3 to a data warehouse, including staging, transformation, and final loading.🔴 Hard · System Design · Asked 1×Have you ever migrated a data pipeline from an on‑premises platform to a cloud platform, or from one cloud platform to another, or from one technology stack to another?🟡 Medium · Behavioral · Asked 1×Could you explain more about the data flow from source to downstream and the technical issues involved?🟡 Medium · Conceptual · Asked 1×How have you used Airflow to orchestrate end‑to‑end data pipelines, for example, extracting data from DMS and loading it into downstream systems?🟡 Medium · Other · Asked 1×Explain the high‑level data flow when accessing data from a CRM system: from database extraction, file ingestion, raw storage, to data curating.🟡 Medium · Conceptual · Asked 1×Describe how you build an end‑to‑end data pipeline.🔴 Hard · System Design · Asked 1×A pipeline ingests data into an ISO table every hour. Over six months, query performance has dropped and S3 storage cost has spiked due to millions of tiny metadata files. What approach would reduce cost and improve pipeline performance?🔴 Hard · System Design · Asked 1×What is metadata in a data pipeline?🟡 Medium · Conceptual · Asked 1×In a project pipeline that processes data files from various sources, can we replace AWS Glue with AWS Lambda functions?🟡 Medium · Conceptual · Asked 1×Suppose 500 million transactions occur per day. Design a pipeline to consume these transactions, perform processing, and every hour submit analytics extracted from the data. How would you architect this system?🔴 Hard · System Design · 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×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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