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Fundbox Interview Questions

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

50questions
~7htotal time
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1
CodingStart here. 7 questions · ~62 min
Linked List ReversalEasy
Practice

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

RecursionLinked ListsArraysFundbox
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2
Metrics4 questions · ~35 min
Define Success Metrics for FeaturesMedium

Set a clear north star, supporting KPIs, leading indicators, and guardrails for a new product feature.

North Star MetricLagging IndicatorsKPIsFundbox
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3
A/B Testing & Experimentation3 questions · ~26 min
Landing Page Conversion Test DesignMedium

Design a landing-page A/B test with clear metrics, power, and significance criteria while guarding against common experiment pitfalls.

Statistical SignificanceSample SizeA/B TestingFundbox
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4
Machine Learning6 questions · ~53 min
Handle Highly Imbalanced ClassesMedium

Build a classifier for a highly imbalanced dataset and choose training and evaluation methods that surface rare positives.

Cross-ValidationFeature EngineeringSupervised LearningFundbox
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5
System Design6 questions · ~53 min
Design Real-Time Fraud Risk ScoringHard

Design a real-time fraud scoring system for card transactions with strict latency, delayed labels, and high availability requirements.

Feature StoreFeature DriftModel ServingFundbox
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6
Product Sense3 questions · ~26 min
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7
More topics21 questions · ~185 min
Attribution Model Selection StrategyMedium

Explain when to use first-touch, last-touch, or multi-touch attribution based on business goals, funnel structure, and measurement limits.

Business Acumenmarketing analyticsattribution modelsFundbox
Consistency Across Service PipelinesMedium

Approach for keeping pipeline outputs consistent when multiple microservices publish overlapping, delayed, or duplicate data.

system designdata consistencymicroservicesFundbox
Debug Training to Production GapHard

Approach for debugging a model that looks strong offline but fails after deployment.

Cross-ValidationCalibrationPrecisionFundbox
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Weekly Service KPI by TeamMedium
Practice
Practice drill

Analyze weekly service delivery performance by team using joins, a CTE, date aggregation, and KPI calculations.

KPIJoinssqlDeloitteReputation
Identify Funnel Bottlenecks in OnboardingHard
Practice
Practice drill

Use joins, CTEs, and aggregations to find the weakest step in an onboarding funnel and estimate lost conversions.

Funnel AnalysissqlDiagnosisAtlassianRevolut
Merchant Volume TrendsMedium
Practice
Practice drill

Use a CTE and window functions to calculate daily, cumulative, and three-day moving transaction volumes by Mastercard MCC.

Window FunctionssqlRunning TotalsMastercard
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.