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Caltech (California) Interview Questions

The questions to prepare for Caltech (California) interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 9 questions · ~79 min
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysCaltech (California)
Implement Binary Search AlgorithmEasy
Practice

Write a binary search function to find a target value in a sorted array.

SearchingCaltech (California)
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2
Execution16 questions · ~140 min
Quality Under Tight DeadlineMedium

Explain how you protect quality on a fixed-deadline engineering project by managing scope, risks, and release criteria.

Launch PlanningTrade-offsScope ManagementCaltech (California)
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3
Statistics & Probability5 questions · ~44 min
Experiment Design for HypothesesMedium

Tests your ability to design rigorous experiments aligned to testable hypotheses.

ExperimentationHypothesis TestingPower AnalysisCaltech (California)
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4
System Design3 questions · ~26 min
Optimizing Chemical Synthesis System DesignHard

Tests your end-to-end system design thinking for AI-driven chemical synthesis optimization.

Feature StoreModel ServingRecommendation SystemsCaltech (California)
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5
Machine Learning6 questions · ~53 min
Predicting Chemical Properties with MLMedium

Tests your ability to design ML approaches for chemistry property prediction.

Hyperparameter TuningFeature EngineeringSupervised LearningCaltech (California)
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6
Behavioral & Leadership8 questions · ~70 min
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7
More topics3 questions · ~26 min
Handling Missing ValuesMedium

Tests data cleaning decisions and analytical impact of missingness.

Data WranglingCase WhenAggregationsCaltech (California)
Grant Writing and FundingMedium

Tests your experience with research funding processes and proposal development.

EstimationGrowth StrategyMarket SizingCaltech (California)
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Flag Invalid Dashboard Revenue RowsEasy
Practice
Practice drill

Use GROUP BY and conditional aggregation to count data quality issues in a single NVIDIA dashboard source table.

Data WranglingCase WhenAggregationsNVIDIA
Clean Duplicate Transactions and Null CostsMedium
Practice
Practice drill

Deduplicate transactions and impute null costs before reporting customer spend.

Data WranglingCase WhenAggregationsApptio
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.