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Prep plan
Updated weekly · Last refresh Aug 30

Cloudflare Software Engineer Interview Questions

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

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1
CodingStart here. 12 questions · ~121 min
Memory-Layered LRU CacheMedium
Practice

Implement a Cloudflare Workers style in-memory LRU cache with O(1) reads, writes, updates, and evictions.

time complexityData Structureslru cacheCloudflare
Count Requests Per DomainEasy
Practice

Parse Cloudflare Logpush request lines and count normalized domains with a hash map.

log parsingData Manipulationedge casesCloudflare
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2
Execution6 questions · ~60 min
Your Strengths and WeaknessesEasy

Tests self-awareness and how you position yourself for success in an Account Executive role at Aqr.

Trade-offsSuccess CriteriaRisk AssessmentCloudflare
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3
System Design12 questions · ~121 min
Edge-to-Core Log Transmission SLAHard

Tests design for latency SLAs, encryption, and high availability in log pipelines.

high availabilityCloudflare
Distributed Hit CounterHard

Evaluates trade-offs for distributed aggregation with low latency and eventual consistency.

distributed systemsevent metricsarchitectureCloudflare
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4
Security & Infrastructure11 questions · ~111 min
TCP vs UDP DifferencesEasy

Assesses foundational networking knowledge and protocol-level trade-offs.

NetworkingprotocolsCloudflare
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5
SQL & Data Manipulation4 questions + 3 drills · ~70 min
6
Behavioral & Leadership3 questions · ~30 min
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7
More topics2 questions · ~20 min
Log Collection With EncryptionHard

Assesses system design for encrypted log aggregation from distributed edge locations.

data securityCloudflare
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.