Redhorse Data Engineer Interview Questions

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

Data Quality in ETL Pipelines

Easy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQuality

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Optimize Slow Spark ETL Pipeline

Hard

Redesign a slow Databricks Spark ETL pipeline to cut runtime from 3 hours to under 60 minutes without breaking data quality or SLAs.

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SQL Performance Optimization Methods

Medium

Tests your knowledge of indexing, query plans, and execution strategies for faster SQL.

Window FunctionsJoinsAggregations

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Optimizing SQL Queries

Easy

Tests your SQL tuning skills to improve runtime, cost, and resource usage.

Window FunctionsJoinsAggregations

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Python Data Aggregation Function

Easy

Tests your practical coding ability for core data transformation tasks.

Hash TablesMathArrays

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Complexity and Optimizations

Hard

Tests your reasoning about performance tradeoffs and algorithmic efficiency.

Hash TablesSearchingSorting

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