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Updated weekly · Last refresh Aug 30

Motional Research Scientist Interview Questions

The questions to prepare for a Motional Research Scientist interview. Questions from real interview reports rank first. Updated weekly.

44questions
~7htotal time
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1
CodingStart here. 6 questions · ~53 min
Directed Graph Cycle DetectionMedium
Practice

Determine whether a directed graph contains a cycle using DFS or topological sorting.

RecursionGraphsMotional
O(1) Insert Delete Random SetEasy
Practice

Implement a set-like structure using an array and hash map to support insert, delete, and random access in average O(1) time.

Hash TablesArraysData StructuresMotional
Nearest Neighbor in High DimensionsHard

Tests algorithmic thinking and efficiency for high-dimensional search problems.

SearchingAlgorithmsperformance analysisMotional
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2
Machine Learning7 questions · ~62 min
Handle Highly Imbalanced ClassificationMedium

Build a classifier for a rare-event problem and choose metrics and training tactics that work when positives are scarce.

Cross-ValidationFeature EngineeringSupervised LearningMotional
Vanishing Gradients in Deep NetworksMedium

Explain vanishing gradients in deep networks and how residual connections, batch normalization, and activation choice improve training.

Neural NetworksDeep LearningGradient DescentMotional
Standard vs Separable ConvolutionsMedium

Compare standard and depthwise separable convolutions, focusing on parameter efficiency, compute cost, and when each is the better choice.

Neural NetworksFeature EngineeringDeep LearningMotional
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3
Behavioral & Leadership29 questions · ~257 min
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4
More topics2 questions · ~18 min
Pedestrian Trajectory PredictionHard

Tests ability to design robust trajectory prediction for autonomous driving safety-critical scenarios.

Motional
LiDAR-Camera Sensor Fusion PipelineHard

Tests system design and technical judgment for fusing asynchronous sensors in autonomous vehicles.

Feature StoreModel ServingMotional
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