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DataZymes Data Engineer Interview Questions

The questions to prepare for a DataZymes Data Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 5 questions + 1 drill · ~62 min
Second Highest Without AggregatesHard
Practice

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsDataZymes
Finding Duplicate RecordsEasy
Practice

Find duplicate customer emails using GROUP BY and HAVING in PostgreSQL.

Group ByHavingAggregationsDataZymes
Optimizing Slow Queries at ScaleHard

Explain how to diagnose and optimize a slow PostgreSQL query on large Apidel Technologies datasets.

SubqueriesJoinsData WranglingDataZymes
Null Handling in JoinsMedium

Tests your understanding of join semantics and null behavior in SQL.

null handlingJoinssql queryDataZymes
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
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2
Pipelines4 questions · ~42 min
Handle PySpark Data SkewMedium

Approach for detecting and mitigating skew in PySpark pipelines using partitioning, join strategies, and runtime monitoring.

Data Qualitypysparkdata skewnessDataZymes
Broadcast Joins in SparkMedium

Tests your Spark join optimization knowledge for large-scale data processing at DataZymes.

pysparkdata processingDataZymes
Load Cloud Data into DataFramesMedium

Tests your practical pipeline skills for ingesting data into Spark for DataZymes analytics.

pysparkdata ingestionDataZymes
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3
More topics1 question · ~10 min
Lazy Evaluation in PySparkMedium

Tests understanding of deferred execution and how it impacts Spark performance.

pysparkDataZymes
The finish line: interview-readyComplete all 10 questions plus 1 hands-on drill to finish this plan.