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Celebal Technologies Data Engineer Interview Questions

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

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 15 questions + 2 drills · ~151 min
Second Highest Without AggregatesHard
Practice

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCelebal Technologies
Understanding ACID Properties in DatabasesMedium

Explain the ACID properties of database transactions and their importance.

Celebal Technologies
Nested Queries vs JoinsMedium

Evaluates your ability to choose between query patterns for correct results and performance.

SubqueriesJoinsCTEsCelebal Technologies
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
SQL Joins Across TablesMedium
Practice
Practice drill

Join Health Catalyst care gap data with patient and outreach records to prioritize active patients needing follow-up.

SubqueriesJoinsData WranglingNumeratorHealth CatalystCelebal Technologies
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2
Coding15 questions · ~131 min
Palindrome Function in PythonEasy
Practice

Check whether a string is a case-insensitive palindrome while ignoring non-alphanumeric characters using two pointers.

RecursionStringsTwo PointersCelebal Technologies
Linear Data Structures FundamentalsEasy

Explain core data structure concepts and compare arrays, linked lists, stacks, and queues with their operations and complexity.

linear data structuresbasicsData StructuresCelebal Technologies
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3
Pipelines16 questions · ~140 min
Secure DevOps Data PipelinesMedium

Approach for embedding security controls into data pipeline delivery, orchestration, and operations.

InfrastructureOrchestrationQualityCelebal Technologies
Optimize Multi-Terabyte ETL PipelineMedium

Explain how you improved a slow ETL pipeline on multi-terabyte data, including bottleneck analysis, tuning choices, and validation.

ETL optimizationdata processingperformanceCelebal Technologies
Batch vs Streaming Data ProcessingEasy

Compare batch and streaming data processing, including when each fits best in a pipeline.

Stream ProcessingETLBatch ProcessingCelebal Technologies
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4
Behavioral & Leadership4 questions · ~35 min
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.