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Catalyst Labs Interview Questions

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

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1
CodingStart here. 4 questions · ~40 min
2
SQL & Data Manipulation5 questions · ~50 min
Second Highest Without AggregatesHard
Practice

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCatalyst Labs
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3
Pipelines5 questions · ~50 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityCatalyst Labs
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4
Machine Learning4 questions · ~40 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 TradeoffCatalyst Labs
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5
Execution5 questions · ~50 min
Recover a Slipping ProjectMedium

Explain how you would diagnose and recover a project that is falling behind schedule without losing stakeholder trust.

Success CriteriaRoadmappingRisk AssessmentCatalyst Labs
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6
Metrics4 questions · ~40 min
Define Success for a ProjectEasy

Define what success means for a project using clear KPIs, a north star, and supporting metrics.

KPIsSuccess CriteriaDiagnosisCatalyst Labs
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7
More topics23 questions · ~230 min
Prioritize Features for a New ProductMedium

A framework for deciding which features should ship first when building a new product.

Feature PrioritizationUser Needsproduct developmentCatalyst Labs
Marketing Campaign A/B Test DesignMedium

Design a marketing campaign experiment with a pre-registered metric plan, power calculation, and ship rule that respects guardrails.

ExperimentationHypothesis TestingA/B TestingCatalyst Labs
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