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CitiusTech Data Engineer Interview Questions

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

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1
PipelinesStart here. 5 questions · ~46 min
Design an ETL Pipeline for Large DatasetsMedium

Design an ETL pipeline to process 10TB of data daily from multiple sources into a data warehouse with strict data quality checks.

InfrastructureETLData ModelingCCitiusTech
Cloud Platform Experience for PipelinesMedium

Describe practical experience building pipelines on AWS, including orchestration, security, and data quality.

InfrastructureETLData ModelingCCitiusTech
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityCCitiusTech
Data Partitioning and ShardingHard

Tests knowledge of data partitioning strategies and scalability concerns.

shardingCCitiusTech
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2
More topics5 questions · ~46 min
SQL Query OptimizationMedium
Practice

Optimize a slow PostgreSQL query that aggregates completed transactions while preserving customers with no matching activity.

Performance Tuningdatabase optimizationindexesCCitiusTech
Core OOP ConceptsMedium

Tests understanding of object-oriented programming and practical application.

coding practicesprogramming conceptsoopCCitiusTech
Joins and Performance ImplicationsMedium

Tests ability to reason about query plans and performance tradeoffs for Flipkart-scale datasets.

JoinsperformanceCCitiusTech
Resolving a High-Stakes Technical ProblemEasy

Tests ownership and judgment in solving a difficult technical problem under ambiguity, including prioritization, communication, and measurable results.

OwnershipDealing With AmbiguityCCitiusTech
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Second and Nth Highest ValuesMedium
Practice
Recently asked
Practice drill

Find the second highest distinct salary and adapt the query to retrieve any requested salary rank.

Data Manipulationsqldatabase queryingTech MahindraSnowflake ComputingKKGISL
Truncate vs DeleteMedium
Practice
Recently asked
Practice drill

Explain how TRUNCATE and DELETE differ in row removal, transaction behavior, and identity handling.

database managementData Manipulationdata managementRRIA AdvisoryCCitiusTechSStandards Australia
The finish line: interview-readyComplete all 10 questions plus 2 hands-on drills to finish this plan.