Data Engineering Interview Kit 2026 – Free Sample (20 Questions)

20 complete questions from the Data Engineering Interview Kit 2026, unabridged: short answers, "what interviewers listen for" boxes (weak vs. strong answer), trade-offs, common mistakes and likely follow-up questions. Plus one fully worked design exercise and one problem from the SQL practice set with its actual DuckDB output.

Topics: SQL, Python for pipelines, Spark, data modeling, system design, Airflow 3, dbt, CI/CD and data quality.

For junior to mid-level data engineers preparing to switch jobs, and for backend, analytics and DevOps engineers moving into data engineering.

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Published by IT-Craftsman. IT-Craftsman is the company of an independent data engineer and DevOps freelancer who has delivered several data engineering and DevOps projects for large companies. He also works for a technology consulting firm, where he conducts hiring interviews for data engineers and DevOps engineers. Quality: every SQL solution was executed in DuckDB; everything else is checked against the official docs. Version 1.0.1, October 2026.

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