Dataford
Top 29
Company roadmap
Updated weekly · Last refresh Aug 30

System2 Interview Questions

The questions to prepare for System2 interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

29questions
~4htotal time
Track your progressSign up free to work through all 29 questions and resume where you left off.
Start practicing free →
1
Machine LearningStart here. 4 questions · ~33 min
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffSystem2
More Machine Learning questions with a free account
2
A/B Testing & Experimentation3 questions · ~24 min
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio MismatchSystem2
Primary vs Guardrail MetricsEasy

Explain how a primary metric differs from a guardrail metric and how both are used in A/B test decisions.

ExperimentationGuardrail MetricsA/B TestingSystem2
More A/B Testing & Experimentation questions with a free account

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
3
Metrics3 questions · ~24 min
Diagnose KPI Drop After ReleaseMedium

Diagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.

KPILeading IndicatorsDiagnosisSystem2
More Metrics questions with a free account
4
Statistics & Probability3 questions · ~24 min
Statistical Significance in Hypothesis TestingEasy

Explain what statistical significance means and why it matters when interpreting experimental or analytical results.

Hypothesis TestingData AnalysisStatistical SignificanceSystem2
More Statistics & Probability questions with a free account
5
Behavioral & Leadership13 questions · ~106 min
More Behavioral & Leadership questions with a free account
6
More topics3 questions · ~24 min
Improve Predictive Model AccuracyMedium

Assess why a predictive model is missing accuracy targets and identify changes that would improve it.

Cross-ValidationAccuracyThreshold TuningSystem2
Propose Investment OpportunitiesHard

Tests analytical reasoning, prioritization, and translating data into investment recommendations at System2.

User NeedsValue PropositionProduct VisionSystem2
SQL Window Functions RankingHard

Tests advanced SQL window functions and correctness for cohort ranking and time-based running totals at System2.

Window FunctionsRankingRunning TotalsSystem2
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Rolling Average and RankingHard
Practice
Practice drill

Use CTEs and window functions to calculate 7-day transaction averages and rank Loft users within each region.

Window FunctionsRankingRunning TotalsLoftArcadisCgi Nederland
Monthly Revenue Running Totals by RegionMedium
Practice
Practice drill

Use joins, monthly aggregation, and window functions to compute running revenue totals and customer rank by region.

Window FunctionsRankingRunning TotalsNTT DATAAppfolio
Rolling 7-Day SQL RankingMedium
Practice
Practice drill

Compute calendar-based 7-day signal averages and rank NASA instruments within each mission group.

Window FunctionsRankingRunning TotalsNASANextera Energy Resources
The finish line: interview-readyComplete all 29 questions plus 3 hands-on drills to finish this plan.