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Long Wave Interview Questions

The questions to prepare for Long Wave interviews, across all roles. Questions from real interview reports rank first. Updated daily.

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1
ExecutionStart here. 4 questions · ~32 min
Prioritize Across Multiple ProjectsEasy

Explain how you prioritize work across multiple operational projects with competing deadlines, impact, and stakeholder pressure.

RoadmappingScope ManagementPrioritizationLong Wave
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2
Product Sense3 questions · ~24 min
Balance User Needs and GoalsMedium

Explain how you balanced user needs with business goals in a product decision, including trade-offs and outcomes.

Feature PrioritizationUser NeedsValue PropositionLong Wave
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3
Coding5 questions · ~41 min
Stack vs Queue DifferencesEasy

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

StackQueueArraysLong Wave
Object-Oriented vs Functional ProgrammingEasy

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

LanguagestechnicalProgrammingLong Wave
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4
Behavioral & Leadership23 questions · ~186 min
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5
More topics4 questions · ~32 min
Design Success Metrics FrameworkMedium

Define a practical framework for judging design success using leading, lagging, and funnel-based product metrics.

KPIsConversion RateEngagement MetricsLong 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
Memory Management in Your LanguageMedium

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

memory managementLong Wave

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
Daily Session Funnel Conversion RatesHard
Practice
Practice drill

Calculate daily session-level funnel conversion rates using CTEs, CASE WHEN, and date functions.

User NeedsData WranglingAggregations
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
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