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Scale Ai Interview Questions

The questions to prepare for Scale Ai interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 7 questions · ~62 min
Validate Nested JSON ConfigurationsMedium
Practice

Parse nested JSON model configs and validate required fields, types, and recursive child dependencies.

json parsingStringsvalidationSScale Ai
LFU-LRU Dataset CacheHard
Practice

Implement an O(1) cache that evicts by lowest frequency, breaking ties by least recent use.

Hash TablescachingHeapSScale Ai
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2
Execution7 questions · ~62 min
3
NLP3 questions · ~27 min
STaR vs PLANSEARCH for CodingMedium

Compare self-training on rationales versus explicit plan search for difficult software engineering reasoning tasks.

reasoning methodsllm planningsoftware engineeringSScale Ai
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4
System Design6 questions · ~53 min
Design Real-Time VLA Failure HandlingMedium

Analyze the main failure modes of a real-time VLA control system in physical environments, including serving, drift, fleet feedback, and safety monitoring.

low latencyfailure modesvla modelsSScale Ai
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5
Behavioral & Leadership17 questions · ~151 min
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6
More topics4 questions · ~36 min
Diagnose Video Loading Pipeline BottlenecksMedium

Identify and fix throughput bottlenecks in a multi-camera video loading pipeline used for model training.

data loadingmonitoringbottlenecksSScale Ai
Evaluate Dataset Quality and CoverageMedium

Define metrics to evaluate dataset quality, diversity, and coverage for a newly collected robotics or autonomous driving dataset.

dataset qualityModel MetricscoverageSScale Ai
Optimize Complex SQL JoinsHard

Tests SQL performance tuning and reasoning about joins, indexes, and query plans for large datasets.

Joinsquery optimizationsqlSScale Ai
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 44 questions plus 3 hands-on drills to finish this plan.