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Criteo Site Reliability Engineer Interview Questions

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

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Explain Solution Time ComplexityEasy

Explain how to analyze an algorithm’s time and space complexity and justify the result from the code structure.

Hash TablesSearchingSorting
Criteo
Two Sum Index Lookup
Easy

Find two indices in an array whose values sum to a target using a hash table in O(n) time.

Hash TablesArraysTwo Pointers
Criteo
Efficient Dataset Sorting or Search
Medium

Evaluates algorithmic thinking and practical efficiency for data operations.

SearchingSorting
Criteo
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OSI Model for Network TroubleshootingMedium

Evaluates ability to map symptoms to network layers during incident troubleshooting.

Infrastructure
Criteo
Design Highly Available AWS Application
Hard

Architect a highly available AWS application with clear trust boundaries, resilient failover, and security controls that preserve availability.

InfrastructureNetworkingQuality
Criteo
DNS Resolution at Scale
Medium

Assesses knowledge of DNS behavior, caching, and failure modes under load.

Networkingdns
Criteo
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Design a Web Search Engine
Hard

Evaluates large-scale system design tradeoffs for indexing and search infrastructure.

Infrastructure
Criteo
Web Services Troubleshooting Focus
Medium

Evaluates operational troubleshooting approach for web services in an SRE context.

NetworkingTroubleshooting
Criteo