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Updated weekly · Last refresh Aug 30

Perchwell Data Engineer Interview Questions

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

25questions
~4htotal time
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1
CodingStart here. 4 questions · ~37 min
Two Sum with TargetEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsPerchwell
Explaining Your Coding ApproachEasy

Tests clarity of reasoning, step-by-step problem decomposition, and communication.

Hash TablesArraysSearchingPerchwell
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2
SQL & Data Manipulation7 questions + 2 drills · ~85 min
SQL Duplicate DetectionEasy
Practice

Find duplicate customer profiles by grouping on identifying fields and returning only repeated records.

Group ByHavingAggregationsPerchwell
Primary Key vs Foreign KeyEasy

Tests relational database fundamentals and how keys enforce data integrity.

database designdata integrityPerchwell
Indexing for PerformanceMedium

Tests knowledge of indexing strategies and performance tradeoffs.

JoinsData WranglingAggregationsPerchwell
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
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
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3
Pipelines13 questions · ~121 min
Batch vs Stream Processing Trade-offsMedium

Compare batch and stream processing across latency, complexity, cost, and data quality in a modern analytics pipeline.

InfrastructureStream ProcessingETLPerchwell
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityPerchwell
Large-Scale Data Pipeline ChallengesMedium

Discuss the main pipeline challenges that appear as data volume, velocity, and system complexity grow.

InfrastructureQualityPerchwell
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4
More topics1 question · ~9 min
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The finish line: interview-readyComplete all 25 questions plus 2 hands-on drills to finish this plan.