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Top 15
Prep plan
Updated weekly · Last refresh Oct 17

Front Backend Engineer Interview Questions

The questions to prepare for a Front Backend Engineer interview. Questions from real interview reports rank first. Updated daily.

15questions
~2htotal time
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1
System DesignStart here. 6 questions · ~49 min
SQL vs NoSQL Trade-offsMedium

Evaluates database selection trade-offs for performance, consistency, and operational complexity.

Trade-offsdatabase designFront
Webhook Notification ArchitectureMedium

Assesses system design for reliable webhook delivery, retries, and idempotency.

api integrationsystem architectureFront
Design High-Volume Email QueuingHard

Evaluates system design for scalable, reliable email delivery under high load.

system architecturescalabilityFront
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2
Execution3 questions · ~24 min
Concurrency Model Trade-offsMedium

Evaluates your understanding of concurrency mechanisms and their practical trade-offs.

performanceprogramming languagesconcurrencyFront
Debugging High Memory UsageHard

Tests your production debugging workflow and ability to isolate root causes.

memory managementproduction issuesDebuggingFront
Handling Transient Microservice FailuresMedium

Tests reliability engineering practices for transient failures in microservices.

error handlingresiliencemicroservicesFront
3
Behavioral & Leadership4 questions · ~33 min
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4
More topics2 questions · ~16 min
Optimizing Slow PostgreSQL Research QueriesMedium

Explain how you diagnosed and optimized a slow PostgreSQL query using execution plans, indexing, and query rewrites.

JoinsData WranglingAggregationsFront
Maintainability as Complexity GrowsMedium

Tests long-term engineering practices like refactoring, modularity, and code quality controls.

best practicescode maintainabilityFront

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Analyze Monthly Revenue Trends by Product CategoryMedium
Practice
Practice drill

Calculate monthly revenue trends per product category using aggregations and window functions.

FrontZulilyGoogle
Database Schema DesignMedium
Practice
Practice drill

Audit user, application, and event relationships to validate completeness and referential integrity.

data relationshipsJoinsData WranglingMercer Francebet365
Optimize Database PerformanceMedium
Practice
Practice drill

Aggregate active endpoint traffic and error rates efficiently for high-traffic application monitoring.

database optimizationJoinsperformanceWarner Bros. DiscoveryMicron Technology
The finish line: interview-readyComplete all 15 questions plus 3 hands-on drills to finish this plan.