Multi-table joins; query optimization for performance
Out loud, in order: clarify, build it, check it, explain it.
Practise SQLLoadingone moment…
Data engineering interview · Media, Streaming & Telecom
A strict three-round, time-boxed loop expecting exact SQL (multi-join + optimization) and Hadoop/Spark fundamentals.
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And what its data engineers work with.
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Stages in the order candidates meet them.
4 stages. 3 rounds have reported questions, described below.
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The topics it covers and the questions candidates reported.
2 reported questions. See them below
1 reported question. See them below
2 reported questions. See them below
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By round. Questions marked Expected are written from the company's standards.
SQLMedium confidence
Python / DSAMedium confidence
Hadoop / SparkMedium confidence
Nobody reported these exact questions at Verizon. They are the questions a loop for each of its top topics is known to ask, so prepare for them as likely, not as confirmed.
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Ranked by how much of the evidence points at each topic.
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Do the first group before the second.
SQL (multi-join, optimization) fast & exact
Do first (3)Hadoop architecture + ingestion; Hive/Spark
DSA/Python
ML-pipeline SLA design
ThenSTAR behavioral
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Why candidates were turned down, as reported.
Not delivering exact correct solutions within the time limit (strict format)
Weak SQL optimization
SQL is named in 37 of 50 company accounts.Shaky Hadoop/Spark
Spark is named in 25 of 50 company accounts.08
5 reported. Each opens and closes. Composites are labelled.
A data engineer shared Verizon SQL questions with multi-table joins and tuning, which shows the coding round is SQL heavy and strict.
What to take from it Practise multi-table joins and query tuning.
In Hyderabad in September 2024: two technical rounds on Hadoop, its architecture and basic Java, then a final round with a director. In live coding the candidate shared their screen and wrote SQL and Python.
What to take from it Know Hadoop architecture and basic Java.
In May 2025 in the US: a live coding round in SQL and Python at medium level, then talk about current and past projects. The candidate got no offer but had a positive view.
What to take from it Practise coding live, and talk through your projects.
Other reports from India describe data structures, programming and SQL with strict time limits and back-to-back questions, and one mentions SQL and Spark. A candidate in Hyderabad said the interviewers asked consulting-style questions instead of data engineering ones.
What to take from it Expect time pressure and some unusual questions.
A January 2022 report describes mostly behavioral questions, such as a time you failed, and no live coding.
What to take from it Prepare a clear story about a failure.
Strict format: two interviewers, back-to-back questions, time limits, expecting exact solutions.
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Their reported questions, one at a time, against a stopwatch.
Multi-table joins; query optimization for performance
Out loud, in order: clarify, build it, check it, explain it.
Practise SQL10
Pick your level and the weeks you have.
Built from what Verizon asks, strongest first. For the wider basics at your level, follow the Mid level plan alongside it.
Pipeline and system design
Read: Data pipeline chaptersDrill: Pipeline practiceSay it aloud: Data pipeline questionsFull plan: Ace the pipeline round
Spark and big data
Read: Spark chaptersDrill: Spark playgroundSay it aloud: Spark questionsFull plan: Ace the Spark round
Python and coding
Read: Python chaptersDrill: Python practiceSay it aloud: Python questionsFull plan: Ace the Python round
Behavioral and communication
Read: Behavioral storytellingSay it aloud: Behavioral questions
Rehearse the Verizon loop
Run the question deckThen repeat your weakest topic once more.