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Tell me about a difficult challenge you faced in a data project and how you solved it

Behavioraleasy0.2 min readPremium
Frequency
Low
Asked at 1 company
Category
144
questions in Behavioral
Difficulty Split
100E|18M|26H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Netflix
Key Concepts Tested
spark
Expert AnswerPremium
50 wordsInterview-ready
Situation: Migrating legacy Oracle/Java pipeline to Spark/S3 while maintaining zero downtime. Task: Validate and phase cutover. Action: Ran both systems in parallel; compared outputs. Incremental logic replication with unit tests. Built reconciliation framework. Phased cutover by dataset. Addressed schema drift and performance....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Netflix. The answer also includes follow-up discussion points that interviewers commonly explore.

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According to DataEngPrep.tech, this is one of the most frequently asked Behavioral interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

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