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ING Backend Engineer Interview Questions

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

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Distributed Transaction Management in Spring BootMedium

Assesses your approach to transactions across services and the tradeoffs involved.

distributed systemsspring boot
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Resilience to Downstream Failures
Hard

Assesses resilience patterns for backend microservices under dependency failures.

resiliencemicroservices
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Spring Bean Lifecycle
Medium

Assesses your understanding of Spring internals and how lifecycle affects backend behavior.

javalifecycledependency injection
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Optimize Data Structure Complexity
Medium

Tests algorithmic thinking and ability to reason about time and space complexity.

space complexitytime complexityData Structures
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Refactor Legacy Code Bottlenecks
Hard

Tests your ability to diagnose performance issues and refactor for maintainability and speed.

refactoring
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Error Handling and Logging
Medium

Evaluates how you design robust error handling and meaningful logs for backend services.

best practiceserror handling
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Database Indexing StrategiesMedium

Assesses your ability to improve query performance using appropriate indexing strategies.

optimization
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Checked vs Unchecked Exceptions
Medium

Tests your understanding of Java exception types and when to use each in production code.

error handlingjava
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