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Wonga Interview Questions

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

50questions
~7htotal time
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1
Machine LearningStart here. 18 questions · ~150 min
Show ML Domain Expertise in Credit RiskEasy

Build and justify a credit default classifier using traditional ML, showing model selection, feature engineering, validation, and explainability.

Hyperparameter TuningNeural NetworksDeep LearningWonga
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2
Model Evaluation3 questions · ~25 min
Choosing Classification Evaluation MetricsEasy

Explain which classification metrics to use and how metric choice depends on the business objective and error tradeoffs.

PrecisionAccuracyRecallWonga
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3
Execution7 questions · ~58 min
Audit-Ready Ledger SchemaHard

Tests your ability to design an auditable ledger with appropriate storage, constraints, and data integrity.

schema designWonga
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4
Coding5 questions · ~42 min
Review Session Code ExplanationMedium

Tests your ability to reason about your code, communicate clearly, and iterate safely under review.

refactoringfunctionsWonga
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5
Behavioral & Leadership10 questions · ~83 min
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6
More topics7 questions · ~58 min
Top 10 Customers SQLEasy
Practice

Use SUM, GROUP BY, ORDER BY, and LIMIT to find the top 10 Healthfirst Marketplace customers by purchase total.

RankingGroup ByAggregationsWonga
Align Product With User NeedsMedium

A framework for connecting user needs to business goals, then making product decisions with clear trade-offs and measurable outcomes.

User NeedsValue PropositionProduct VisionWonga
Applying SOLID DailyMedium

Tests your ability to apply SOLID principles to produce maintainable, reliable code in a production fintech environment.

solid principlesWonga
Design a Web API AppMedium

Evaluates your approach to structuring services, endpoints, and maintainable API design.

SecurityWonga
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
SQL Top Three ClientsEasy
Practice
Practice drill

Aggregate transaction amounts to return the three highest-spending clients.

RankingGroup BytransactionsGartner
SQL Joins for Campaign and TransactionsMedium
Practice
Practice drill

Combine campaign spend with completed transaction totals while preserving campaigns that have no matching transactions.

null handlingJoinsData WranglingSeatgeek
The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.