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Updated weekly · Last refresh Sep 9

Long Wave Software Engineer Interview Questions

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

19questions
~3htotal time
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1
CodingStart here. 5 questions · ~41 min
Object-Oriented vs Functional ProgrammingEasy

Compare object-oriented and functional programming in terms of state, abstraction, side effects, and design tradeoffs.

LanguagestechnicalProgrammingLong Wave
Stack vs Queue DifferencesEasy

Compare stack and queue behavior, access order, operations, and common use cases in linear data structures.

StackQueueArraysLong Wave
Bejeweled-Style Block ClearingHard

Tests your ability to design an algorithm for pattern matching and removal in a grid-based game.

Long Wave
Cache Design for High TrafficHard

Tests your ability to design caching strategies with correctness, performance, and failure handling.

Hash TablesLinked ListsHeapLong Wave
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2
Behavioral & Leadership11 questions · ~90 min
Motivation for Defense Mission WorkEasy

Tests mission alignment and whether the candidate connects personal motivation to ownership, responsibility, and real behavior under pressure.

company fitnational securitymotivationLong Wave
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3
More topics3 questions · ~25 min
Memory Management in Your LanguageMedium

Tests understanding of runtime memory behavior and implications for performance and correctness.

memory managementLong Wave
Real-Time Sensor Data PipelineHard

Tests your ability to design reliable streaming pipelines for time-sensitive data.

InfrastructureStream ProcessingQualityLong Wave
Optimizing Slow Database QueriesMedium

Tests your approach to diagnosing and improving SQL performance under real constraints.

SubqueriesJoinsperformanceLong Wave

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
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
SQL Join Matching RowsEasy
Practice
Practice drill

Filter Revature assessment records to find candidates who passed SQL Fundamentals, then sort the matching rows by candidate name.

SubqueriesJoinsData WranglingIncedoCloudFactoryRevature
The finish line: interview-readyComplete all 19 questions plus 3 hands-on drills to finish this plan.