DataZymes Data Engineer Interview Questions

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

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SQL & Data ManipulationStart here. 5 questions · ~73 min

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

Second Highest Without AggregatesHard

Practice

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

SubqueriesRankingSelf-Joins

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Optimizing Slow Queries at ScaleHard

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

SubqueriesJoinsData Wrangling

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Null Handling in JoinsMedium

Practice

Match records when join keys may be NULL, while retaining unmatched source rows.

null handlingJoinssql query

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Pipelines4 questions · ~58 min

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

Broadcast Joins in SparkHard

Explain how to implement a broadcast join, when it improves distributed ETL performance, and which memory and data-size risks to manage.

pysparkdistributed computingETL optimization

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Load Cloud Data into DataFramesHard

Explain how to authenticate, read cloud storage files into a DataFrame, apply schema and quality checks, and handle failures.

data loadingdata pipelinepyspark

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