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Persistent Backend Engineer Interview Questions

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

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Design API Rate LimiterHard

Explain a queue-based, stateful rate limiter for concurrent workers calling third-party APIs safely and efficiently.

APIsabstractionrate limiting
Persistent
Refactor for Readability and Speed
Medium

Tests your ability to improve code quality while maintaining correctness and efficiency.

Persistent
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Explain ACID in Transaction SystemsEasy

Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.

acid propertiestransactionsdata integrity
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Persistent
Understanding ACID Properties in Databases
Medium

Explain the ACID properties of database transactions and their importance.

Persistent
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Synchronous vs Asynchronous Processing
Medium

Assesses understanding of request flow, throughput, and trade-offs in backend systems.

Persistent
Data Consistency in Microservices
Hard

Tests your consistency strategy across services, including transactions and eventual consistency.

distributed systemsconsistencymicroservices
Persistent
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Optimize Slow API Endpoints
Medium

Assesses performance troubleshooting and optimization for backend APIs.

performance
Persistent
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Secure REST APIs
Medium

Evaluates REST API security knowledge and practical mitigation techniques.

security vulnerabilitiesrest apismitigation
Persistent
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