Reddit Site Reliability Engineer Interview Questions

The questions to prepare for a Reddit Site Reliability Engineer interview. Questions from real interview reports rank first. Updated weekly.

12questions

~2htotal time

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ExecutionStart here. 5 questions · ~40 min

Assesses advanced reliability techniques to prevent and contain failure propagation.

Consistency Model Trade-offsMedium

Evaluates your understanding of consistency, availability, and correctness trade-offs in distributed systems.

Trade-offsdistributed databases

Defining SLOs and SLIsMedium

Assesses your ability to set measurable reliability targets and operationalize them for a new service.

Capacity Planning for GrowthMedium

Tests your ability to forecast demand and plan infrastructure for reliability and performance.

distributed systemsscalabilitycapacity planning

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Coding3 questions · ~24 min

Evaluates your approach to authentication session management, reliability, and security considerations.

Game Scoring System DesignMedium

Assesses your system design skills for modeling data flows, correctness, and scalability in a scoring use case.

system design

Production-Ready Cache ProtocolHard

Evaluates your ability to design and harden a networked caching service with correct protocol and connection handling.

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Behavioral & Leadership4 questions · ~32 min

Balancing Deploy Speed and TestingMedium

Assesses your ability to design safe delivery practices that preserve reliability while moving fast.

Testingbalance

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