DataEngPrep.tech
1863 data engineering interview questions with expert answer
DataEngPrep.tech launched on March 20, 2026.
What it does
DataEngPrep is a focused interview prep platform for Data Engineers, featuring 1,863 real questions from Amazon, Google, Databricks, and more. Each answer goes beyond basics -- covering trade-offs, architecture, and real-world thinking. Get free previews, unlock deep solutions with Pro, and prepare smarter with company-specific questions. Built for engineers targeting $120K–$400K+ roles. Try it free: https://dataengprep.tech
Paste your answer. See exactly what's wrong, what's missing, and how a FAANG engineer would say it. Fix your answers before the real interview.
JavaScript is required to use this application. Please enable JavaScript in your browser settings or disable any extensions that may be blocking scripts. Paste your answer. Get told exactly what's wrong, what's missing, and how a FAANG engineer would say it. Paste any data engineering interview answer. Our AI tells you what's unclear, what's missing, and provides a stronger example response. What is a window function in SQL? When would you use one instead of GROUP BY? “A window function is like an aggregate function but it doesn't group the rows. It uses OVER clause. You can do things like ROW_NUMBER and RANK. GROUP BY collapses rows but window functions don't.” “A window function performs…from dataengprep.tech
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