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Updated weekly · Last refresh Sep 18

Crayon Data Software Engineer Interview Questions

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

36questions
~6htotal time
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1
CodingStart here. 12 questions · ~115 min
Two Sum with TargetEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsCrayon Data
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysCrayon Data
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2
SQL & Data Manipulation9 questions + 2 drills · ~106 min
Second Highest Without AggregatesHard
Practice

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

SubqueriesRankingSelf-JoinsCrayon Data
Explain ACID in Transaction SystemsEasy

Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.

acid propertiestransactionsdata integrityCrayon Data
Top Customers by Sales RevenueEasy
Practice
Practice drill

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsHousecall ProEquifaxXYZ
SQL Data Structure ReviewHard
Practice
Practice drill

Audit PostgreSQL metadata for missing or invalid keys and tables with inefficient sequential-scan patterns.

database optimizationindexesData StructuresMercury
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3
Technical Fundamentals6 questions · ~57 min
Multithreading and Thread SafetyMedium

Tests concurrency fundamentals and safe shared-state design.

multithreadingjavathread safetyCrayon Data
How Java Garbage Collection WorksMedium

Tests your understanding of JVM memory management and how it impacts application behavior.

memory managementjavaCrayon Data
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4
Behavioral & Leadership5 questions · ~48 min
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5
More topics4 questions · ~38 min
Spark Performance Tuning ApproachMedium

Tests ability to diagnose and improve Spark job performance in production pipelines.

Performance TuningsparkCrayon Data
Scalability of a SystemHard

Tests system design thinking for growth, reliability, and performance under load.

system designscalabilityCrayon Data
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The finish line: interview-readyComplete all 36 questions plus 2 hands-on drills to finish this plan.