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Updated weekly · Last refresh Aug 30

Clickhouse Software Engineer Interview Questions

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

31questions
~5htotal time
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1
CodingStart here. 7 questions · ~61 min
Compute Nth Fibonacci NumberEasy
Practice

Compute the nth Fibonacci number using an iterative dynamic programming approach with O(n) time and O(1) space.

RecursionMathDynamic ProgrammingClickhouse
Explain Time ComplexityEasy

Tests ability to analyze algorithm efficiency and communicate tradeoffs.

MathArraysClickhouse
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2
Pipelines4 questions · ~35 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityClickhouse
Real-Time Dashboard Data PipelineMedium

Design a streaming pipeline that keeps dashboard data fresh and accurate for operational reporting.

InfrastructureStream ProcessingOrchestrationClickhouse
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3
SQL & Data Manipulation3 questions + 3 drills · ~56 min
Database Indexing FundamentalsMedium

Tests understanding of database indexing concepts and how they affect query performance.

JoinsData WranglingAggregationsClickhouse
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
Resolve Conflicting Customer AttributesMedium
Practice
Practice drill

Use joins, CTEs, and row ranking to resolve conflicting customer profile values across ACME House systems.

JoinsData WranglingQualityRamsey SolutionsACME House
Clean Inconsistent Expense EntriesHard
Practice
Practice drill

Clean inconsistent expense records with CTEs, joins, CASE logic, and aggregation to summarize valid spend by department.

Data WranglingAggregationsQualityUniversity of Colorado Denver
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4
Security & Infrastructure3 questions · ~26 min
Replication and Consistency in Distributed SystemsHard

Tests knowledge of replication strategies, consistency models, and failure-mode reasoning.

InfrastructureDependenciesQualityClickhouse
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5
Behavioral & Leadership10 questions · ~87 min
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6
More topics4 questions · ~35 min
Architecting a Distributed DatabaseHard

Tests system design ability across sharding, replication, query routing, and operational concerns.

Feature StoreRetrievalModel ServingClickhouse
Software Solution Trade-offsMedium

Tests decision-making criteria across performance, reliability, complexity, and cost.

Trade-offsRisk AssessmentScope ManagementClickhouse
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The finish line: interview-readyComplete all 31 questions plus 3 hands-on drills to finish this plan.