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SoFi Data Scientist Interview Questions

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

50questions
~7htotal time
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1
MetricsStart here. 7 questions · ~59 min
Calculate LTV for New SoFi Invest MembersMedium

Calculate the lifetime value (LTV) of a new SoFi Invest member and decompose factors influencing it.

CACLTVEngagement MetricsSoFi
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2
Machine Learning7 questions · ~59 min
Predictive Analytics Model SelectionMedium

Explain how you would build and evaluate a predictive analytics model for a supervised learning problem.

Feature EngineeringModel EvaluationSupervised LearningSoFi
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3
Model Evaluation5 questions · ~42 min
Evaluate Personal Loan Rate RegressionMedium

Evaluate a SoFi Personal Loans regression model whose RMSE rose from 0.62 to 0.91 and now underpredicts APR for thin-file borrowers.

MAERMSESoFi
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4
Pipelines6 questions · ~51 min
Data Collection and Validation ExperienceEasy

Explain how you have collected data from source systems and validated it before loading it into analytics tables.

ToolsData ModelingQualitySoFi
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5
Product Sense6 questions · ~51 min
Measure New Feature Launch SuccessMedium

Define a practical framework for measuring whether a new feature launch in a banking app is actually successful.

product analysisMetricsfeature evaluationSoFi
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6
A/B Testing & Experimentation6 questions · ~51 min
Design an Installment-Flow ExperimentMedium

Design an A/B test for a new checkout installment-flow feature, including metrics, power, guardrails, and a disciplined ship decision.

ExperimentationHypothesis TestingA/B TestingSoFi
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7
More topics13 questions · ~110 min
Sample Size for A/B TestsEasy

Choose sample size and runtime by combining baseline rate, MDE, alpha, power, and expected traffic.

Power AnalysisSample SizeA/B TestingSoFi
Optimizing Large Transaction Table JoinsHard

Explain how to tune a slow PostgreSQL query that joins several large transaction tables using indexes, join strategy, and partitioning.

JoinsperformancesqlSoFi
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
SQL for Queue PerformanceMedium
Practice
Practice drill

Aggregate monthly queue volume and SLA attainment to compare operational performance over time.

Date FunctionsJoinssqlSoFi
SQL Duplicate Transaction DetectionMedium
Practice
Practice drill

Identify repeated transaction records within February 2025 using aggregation, date filtering, and account joins.

fraud detectionJoinsReconciliationSoFi
The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.