Top 18
Prep plan
Updated weekly · Last refresh Oct 17

Zachary Piper Data Engineer Interview Questions

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

18questions
~3htotal time
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1
CodingStart here. 3 questions · ~31 min
Merge Two Sorted ArraysEasy
Practice

Merge two sorted arrays into one sorted array using a two-pointer linear scan.

ArraysSortingTwo PointersZachary Piper
Time Complexity for Data SolutionsEasy

Tests your ability to reason about performance characteristics and scalability of algorithms.

MathArraysSearchingZachary Piper
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2
Pipelines10 questions · ~104 min
Warehouse Analytics ExperienceEasy

Discuss practical experience using a data warehouse for analytics, including loading, transformation, orchestration, and data quality.

InfrastructureData ModelingZachary Piper
Cloud Pipeline Data SecurityMedium

Key security considerations for a cloud data pipeline, from ingestion through storage, orchestration, and monitoring.

InfrastructureGovernanceETLZachary Piper
Real-Time Dashboard Pipeline DesignHard

Approach for building near-real-time dashboard pipelines with streaming, orchestration, and data quality controls.

Stream ProcessingSchedulingDependenciesZachary Piper
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3
SQL & Data Manipulation4 questions + 1 drill · ~52 min
Optimizing a Slow QueryMedium
Practice

Rewrite a slow PostgreSQL reporting query to reduce scanned rows, avoid join multiplication, and return accurate monthly site metrics.

Subqueriesdatabase optimizationJoinsZachary Piper
SQL vs NoSQL Trade-offsEasy

Explain SQL vs NoSQL trade-offs, including schema design, consistency, scaling, and query flexibility.

JoinsData WranglingAggregationsZachary Piper
SQL vs NoSQL for Go-to-Market DataEasy

Explain how SQL and NoSQL differ in schema, consistency, scaling, and Demandbase-style analytics use cases.

JoinsData WranglingZachary Piper
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
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4
More topics1 question · ~10 min
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The finish line: interview-readyComplete all 18 questions plus 1 hands-on drill to finish this plan.