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Updated weekly · Last refresh Aug 30

Klaviyo Data Engineer Interview Questions

The questions to prepare for a Klaviyo Data Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~50 min
7-Day Rolling Active UsersMedium
Practice

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsKlaviyo
Dimensional vs Normalized ModelsMedium

Tests data modeling trade-offs and choosing the right model for analytics versus transactions.

star schemanormalizationData ModelingKlaviyo
Model Star Schema for CampaignsHard

Tests your ability to model analytics data for Klaviyo using dimensional design and relationships.

star schemadimensionsData ModelingKlaviyo
Top 10 Customers SQLEasy
Practice
Practice drill

Use SUM, GROUP BY, ORDER BY, and LIMIT to find the top 10 Healthfirst Marketplace customers by purchase total.

RankingGroup ByAggregationsBBusiness Integration Partners (BIP)RANDHealthfirst (New York)
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
2
Pipelines5 questions · ~50 min
Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQualityKlaviyo
Backfill While Preserving Real TimeHard

Approach for running large historical backfills without breaking real-time pipeline freshness or correctness.

Stream ProcessingDependenciesBackfillingKlaviyo
Design SCD Type 1 and 2Medium

Design and implement SCD Type 1 and Type 2 dimensions with history tracking, idempotent loads, and data quality controls.

slowly changing dimensionsData ModelingBackfillingKlaviyo
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3
Behavioral & Leadership5 questions · ~50 min
More Behavioral & Leadership questions with a free account
4
More topics2 questions · ~20 min
Aggregate Error Codes from LogsEasy
Practice

Parse log lines, extract matching error codes from strings, and count occurrences with a hash table in one pass.

Hash TablesArraysStringsKlaviyo
Debug and Fix CodeMedium

Tests your ability to debug code, identify root causes, and implement correct fixes.

DebuggingKlaviyo

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