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Updated weekly · Last refresh Sep 29

Reddit Backend Engineer Interview Questions

The questions to prepare for a Reddit 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 · ~50 min
Distributed Click Tracking and SearchHard

Evaluates your end-to-end system design and your ability to implement search and indexing logic.

distributed systemsReddit
High Uptime DeploymentsHard

Evaluates your deployment strategy, reliability practices, and rollback planning for production systems.

deploymentReddit
Auth at Massive ConcurrencyHard

Assesses your system design skills for scalable authentication under extreme concurrency.

authenticationscalabilityhigh availabilityReddit
Relational vs NoSQL LogsMedium

Evaluates your ability to choose storage systems based on access patterns, consistency, and cost.

Trade-offsdatabasesdata storageReddit
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2
Coding5 questions · ~42 min
Top Terms From CommentsMedium

Tests your ability to design and reason about text processing and frequency analysis for community data.

data processingfrequency countStringsReddit
API Rate LimiterMedium

Tests your ability to implement scalable request limiting with correct edge-case handling.

apirate limitingimplementationReddit
Permission Check DesignMedium

Assesses how you model authorization and implement low-latency permission checks.

efficiencyauthorizationSecurityReddit
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3
Behavioral & Leadership4 questions · ~34 min
Disagreeing on Technical Debt PrioritiesMedium

Tests conflict resolution and influence when balancing technical debt against product delivery with cross-functional stakeholders.

Conflict ResolutionStakeholder Managementtechnical debtReddit
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The finish line: interview-readyComplete all 15 questions to finish this plan.