Interview questions
Preparing for a data engineering interview at Impetus? This page contains 5 real interview questions sourced from verified Impetus interview experiences. Questions are sorted by frequency — the ones asked most often appear first.
Impetus data engineering interviews typically focus on SQL, System Design/Architecture, and Spark/Big Data. The interview bar skews toward harder problems (2 hard vs. 0 easy), suggesting emphasis on depth and system-level thinking.
Use the difficulty filters above to focus your preparation. For each question, attempt your own answer first, then compare with our expert solution. You can also practice these questions in our AI Mock Interview Coach for real-time feedback.
What is the difference between cache() and persist() in Spark? When would you use each?
Demonstrate the difference between DENSE_RANK() and RANK()
Detail examples of inner, outer, left, and right joins.
Explain AWS Glue Data Catalog.
Explain why lineage in Spark is crucial for fault tolerance.
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