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Apple Applied Scientist Interview Questions

The questions to prepare for a Apple Applied Scientist interview. Questions from real interview reports rank first. Updated daily.

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1
CodingStart here. 4 questions · ~42 min
Predict Next Word from Text CorpusMedium
Practice

Clean text, count word transitions, and return the most probable successor with deterministic tie-breaking.

CodingData StructuresAlgorithmsApple
Design a Custom Data StructureHard
Practice

Implement a set-like data structure with average O(1) add and remove operations using an array and hash map.

Data StructuresAlgorithmsApple
Randomized Get/Insert StructureHard
Practice

Implement insert, delete, and random selection in average O(1) time using an array and hash map.

ArraysData StructuresAlgorithmsApple
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2
System Design7 questions · ~74 min
Handle Hallucinations in GenAIHard

Explain hallucination controls, embedding generation, vector retrieval, and prompt-to-embedding workflows in a production GenAI system.

factual groundingmodel inferencefailure modesApple
Search Ranking System ArchitectureHard

Evaluates your system design tradeoffs for building a scalable, high-performance ranking system.

relevancesystem architectureApple
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3
Behavioral & Leadership6 questions · ~63 min
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4
More topics3 questions · ~32 min
Architecture Choice Tradeoff ExplanationMedium

Explain how you weighed accuracy, generalization, complexity, and operational constraints when selecting a model architecture.

Decision MakingTrade-offsarchitectureApple
Monitor Production Model PerformanceHard

Approach for monitoring a model in production and spotting drift, threshold issues, and calibration loss.

PrecisionAccuracyRecallApple
Handling ML Model Cold StartsMedium

Assesses your strategies for maintaining quality and reliability when models are newly deployed.

Machine LearningApple
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