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Updated weekly · Last refresh Aug 30

ECS Software Engineer Interview Questions

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

30questions
~5htotal time
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1
CodingStart here. 6 questions · ~55 min
Longest Unique Substring in EnoMedium
Practice

Use a sliding window and hash map to find the longest substring without repeated characters in a string.

Hash TablesStringsTwo PointersECS
Reverse a String in PythonEasy
Practice

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonECS
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2
System Design4 questions · ~37 min
Design a Highly Available ML Serving PlatformMedium

Design a distributed ML serving platform that stays available and scales under failures, traffic spikes, and model updates.

distributed systemsscalabilityhigh availabilityECS
Monolith vs Microservices Trade-offsMedium

Tests architectural reasoning and ability to choose the right approach for constraints and goals.

InfrastructureDependenciesQualityECS
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3
Security & Infrastructure3 questions · ~28 min
Troubleshoot Critical System FailureHard

Tests incident triage, root-cause analysis, and structured troubleshooting under pressure.

InfrastructureDependenciesQualityECS
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4
Behavioral & Leadership14 questions · ~129 min
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5
More topics3 questions · ~28 min
Prioritize Work Under Tight DeadlinesEasy

Explain how you prioritize competing work under time pressure while making trade-offs and keeping stakeholders aligned.

Trade-offsRoadmappingScope ManagementECS
Design Real-Time Feature PipelineHard

Design a real-time feature pipeline processing 120K events/sec into low-latency feature tables and warehouse models with replay and quality controls.

InfrastructureStream ProcessingOrchestrationECS
Optimize an Underperforming AppMedium

Tests performance troubleshooting, measurement, and prioritization of fixes.

Trade-offsRisk AssessmentScope ManagementECS
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