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Updated weekly · Last refresh Sep 26

Transport for London Data Scientist Interview Questions

The questions to prepare for a Transport for London Data Scientist interview. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 4 questions + 2 drills · ~54 min
Using SQL Window FunctionsMedium
Practice

Calculate three-day rolling passenger entry averages for TfL stations using aggregation and window functions.

Window FunctionsData AnalysissqlTransport for London
SQL Average Delay by TimeMedium
Practice
Practice drill

Calculate average completed-service delay per TfL line and time-of-day category.

Joinssql queryData AnalysisTransport for London
Second Attempt Score Per UserEasy
Practice
Practice drill

Use ROW_NUMBER to return each student's second score on a specified Khan Academy exercise.

Data Analysissqluser engagementKhan Academy
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2
A/B Testing & Experimentation6 questions · ~51 min
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 MismatchTransport for London
Validating Conflicting Experiment ResultsMedium

Tests your troubleshooting and validation process for inconsistent experimental outcomes.

Transport for London
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3
Product Sense6 questions · ~51 min
Investigating Route Satisfaction DropsMedium

Assesses your diagnostic approach to operational and customer-impact issues using data.

root cause analysisUser NeedsTransport for London
Defining a Successful Underground JourneyMedium

Assesses your ability to define user-centered outcomes aligned to Transport for London’s service goals.

user experiencesuccess metricsTransport for London
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4
Behavioral & Leadership7 questions · ~59 min
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5
More topics4 questions · ~34 min
Ensuring Significance in Public Transport StudiesMedium

Evaluates your approach to study design, assumptions, and rigor for public transport experiments.

Statistical SignificanceTransport for London
Explaining Linear Regression SimplyEasy

Assesses your ability to communicate core ML concepts clearly and accurately.

linear regressionexplanationTransport for London
Diagnosing TfL Go Engagement DropsMedium

Tests your ability to investigate metric declines using structured data analysis.

Diagnosisuser engagementTransport for London
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The finish line: interview-readyComplete all 27 questions plus 2 hands-on drills to finish this plan.