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Numero Data Interview Questions

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

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1
SQL & Data ManipulationStart here. 8 questions + 3 drills · ~94 min
Handling Missing and Dirty SQL DataMedium

Explain how to profile, clean, and standardize missing or dirty data before analysis.

Data WranglingCase WhenQualityNumero Data
Explain SQL Join TypesEasy

Explain INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF JOINs with examples and when to use each.

JoinsData WranglingGroup ByNumero Data
Handling Missing Data in SQLEasy

Explain practical SQL techniques for handling NULLs and missing values in product analysis without biasing metrics.

Data WranglingCase WhenAggregationsNumero Data
Cloud Warehouse vs On-PremMedium

Tests understanding of data platform architecture and decision-making trade-offs.

Trade-offsdatabaseNumero Data
Autonomous vs Manual Drive TimeHard
Practice
Practice drill

Compute per-vehicle daily autonomous vs manual seconds from state-change logs using LEAD and conditional aggregation.

JoinsData WranglingGroup By
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Normalize Messy CRM Contact DataHard
Practice
Practice drill

Clean inconsistent CRM contacts by joining source tables, standardizing values, and flagging bad records.

Data WranglingCase WhenQualityAlphaSense
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2
Behavioral & Leadership13 questions · ~104 min
Missing a Critical Project DeadlineMedium

Tests ownership after a missed deadline, including stakeholder communication, recovery actions, and self-reflection on planning mistakes.

resiliencefeedbackOwnershipNumero Data
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3
More topics3 questions · ~24 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityNumero Data
Define User Engagement MetricMedium

Tests metric definition, event selection, and alignment to business-facing analytics needs.

user engagementNumero Data
Mitigate Data Pipeline BottlenecksMedium

Tests ability to diagnose pipeline performance and reliability issues.

data pipelinebottlenecksNumero Data

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