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Top 50 Software Engineer Interview Questions

The 50 most important questions to prepare for Software Engineer interviews. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
CodingStart here. 15 questions · ~125 min
Linked List ReversalEasy
Recently asked

Tests basic coding ability and pointer/data-structure manipulation.

RecursionLinked ListsArraysPearlRapid Ratings InternationalCoBank
Implement Binary SearchEasy
Recently asked

Tests algorithm implementation skills and correctness reasoning.

RecursionArraysSearchingCoBankHHAeXchangeCandescent
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2
Execution15 questions · ~125 min
Design a Scalable ApplicationEasy
Recently asked

Explain how you would design a scalable application, including trade-offs, risks, stakeholder needs, and how you define success.

Trade-offsRisk AssessmentScope ManagementHearstBMW of North AmericaCrescent Electric Supply
Choose Monolith or MicroservicesMedium
Recently asked

Evaluate the execution trade-offs between monoliths and microservices and explain how you would choose the right approach.

Trade-offsRisk AssessmentScope ManagementBlue Cross Blue Shield of Michigan66degreesBelvedere Trading
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3
System Design6 questions · ~50 min
Design a URL Shortening ServiceHard
Recently asked

Design a URL shortening service that routes, ranks, and monitors links at scale.

Feature StoreModel ServingAmazon DSPApplied IntuitionDover India
Design Feature Drift Monitoring SystemHard
Recently asked

Design a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.

Feature StoreFeature DriftModel ServingAlpacaMetaDevoteam
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4
Pipelines4 questions · ~33 min
Data Quality in ETL PipelinesEasy
Recently asked

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityBookingClarify Health SolutionsUniversity of Arkansas
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5
SQL & Data Manipulation6 questions + 3 drills · ~80 min
SQL vs NoSQL Trade-offsEasy
Recently asked

Explain SQL vs NoSQL trade-offs, including schema design, consistency, scaling, and query flexibility.

JoinsData WranglingAggregationsInsight GlobalUniversity of Southern CaliforniaBungalow
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 & MoreHD SupplyBenjamin 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
Reconcile Conflicting Invoice TotalsMedium
Practice
Practice drill

Reconcile billing and ERP invoice totals using joins, a CTE for latest snapshots, and CASE-based discrepancy classification.

JoinsData WranglingQualityLiterati
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6
Behavioral & Leadership4 questions · ~33 min
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.