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Rad Hires Backend Engineer Interview Questions

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

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Notification System at Massive Scale
Hard

Tests your ability to design high-throughput messaging systems with reliability and delivery guarantees.

system designnotification systemscalability
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Identifying and Mitigating Bottlenecks
Hard

Evaluates your performance thinking and ability to improve complex backend systems.

system designcomplex systemsbottlenecks
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Debugging Memory Leaks in Distributed Services
Hard

Tests your troubleshooting approach across services, tooling, and observability to isolate leaks.

memory leakdistributed systemsDebugging
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Missing a Critical Project Deadline
Medium

Tests ownership after a missed deadline, including stakeholder communication, recovery actions, and self-reflection on planning mistakes.

resiliencefeedbackOwnership
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Efficient Complex Tree TraversalMedium

Assesses your ability to implement efficient algorithms for non-trivial data structures.

Data Structuresefficiency
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Rate Limiting for High-Traffic APIs
Medium

Evaluates your design of protective controls for backend reliability and fairness under load.

apirate limiting
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Zero-Downtime Database MigrationsHard

Tests production-safe migration design and risk mitigation techniques.

zero downtimeproduction
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Relational vs NoSQL Trade-offs
Medium

Evaluates your data modeling and storage decisions aligned to backend product requirements.

Trade-offsdatabase design
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