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Frontier Interview Questions

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

50questions
~8htotal time
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1
CodingStart here. 4 questions · ~39 min
Shortest Path in a GraphHard
Practice

Find the minimum-cost path between two nodes in a weighted graph using Dijkstra's algorithm.

QueueSearchingGraphsFrontier
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2
SQL & Data Manipulation6 questions + 2 drills · ~79 min
Audit Inherited Spreadsheet ExceptionsMedium
Practice

Audit an inherited spreadsheet by reconciling source records to flag missing, duplicate, and invalid rows.

PivotData WranglingQualityFrontier
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

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

InfrastructureToolsData WranglingBenjamin MooreCommonwealth Bank of AustraliaAbercrombie and Fitch
Normalize Messy CRM Contact DataMedium
Practice
Practice drill

Clean inconsistent CRM contacts by joining source tables, standardizing values, and flagging bad records.

Data WranglingCase WhenQualityAlphaSense
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3
Execution6 questions · ~59 min
Handle Conflict Within Your TeamEasy

Explain how you handle team conflict while keeping delivery on track and maintaining trust across stakeholders.

Trade-offsRisk AssessmentScope ManagementFrontier
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4
Metrics6 questions · ~59 min
Investigate User Engagement DeclineMedium

Investigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.

RetentionDiagnosisEngagement MetricsFrontier
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5
Pipelines3 questions · ~29 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityFrontier
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6
Statistics & Probability6 questions · ~59 min
A/B Testing for Product FeaturesMedium

Explain how to design and evaluate an A/B test for a product feature, including metrics, MDE, sample size, and guardrails.

Hypothesis TestingStatistical SignificanceA/B TestingFrontier
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7
More topics19 questions · ~186 min
Research Motivation Product LensEasy

Explain what drives strong research work and how that motivation connects to user value and product outcomes.

User NeedsValue PropositionFrontier
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchFrontier
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.