Front Backend Engineer Interview Questions

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

Ensuring Distributed Data Consistency

Medium

Assesses approaches to consistency, correctness, and failure handling in distributed systems.

distributed systemsfault tolerancedata consistency

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Design High-Volume Email Queuing

Hard

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

system architecturescalability

Front

API Rate Limiting Service Design

Medium

Tests your ability to design rate limiting with correctness and scalability in mind.

api designsystem architecturerate limiting

Front

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

Concurrency Model Trade-offs

Medium

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

performanceprogramming languagesconcurrency

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Handling Transient Microservice Failures

Medium

Tests reliability engineering practices for transient failures in microservices.

error handlingresiliencemicroservices

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

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Maintainability as Complexity Grows

Medium

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

best practicescode maintainability

Front