Top 41
Prep plan
Updated weekly · Last refresh Aug 30

Replit Data Engineer Interview Questions

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

41questions
~6htotal time
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1
SQL & Data ManipulationStart here. 10 questions + 1 drill · ~96 min
Deduplicate Out-of-Order Replication EventsMedium
Practice

Use ROW_NUMBER() to keep the earliest created_at 'Repl created' per entity and return out-of-order duplicates to delete.

Window FunctionsSubqueriesJoinsReplit
Calculate 30-Day User RetentionHard
Practice

Use CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.

Window FunctionsDate FunctionsAggregationsReplit
MAU Query With Deployment FilterMedium

Tests your SQL skills for cohorting, filtering, and time-windowed active user definitions.

JoinsGroup ByAggregationsReplit
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
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2
Pipelines30 questions · ~258 min
Privacy Compliance in Data PipelinesMedium

Approach for building privacy controls, lineage, and auditability into data pipelines that handle personal data.

Compliancedata privacyPipelinesReplit
Monitoring Tools for Data PipelinesEasy

Preferred tools and approach for monitoring and managing data pipelines in production.

InfrastructureToolsQualityReplit
Choosing Batch vs Real TimeHard

Evaluate when a pipeline should use stream processing versus scheduled batch based on latency, cost, complexity, and data quality needs.

Stream ProcessingBatch ProcessingDependenciesReplit
Star vs Snowflake SchemaEasy

Compare star and snowflake schemas in a warehouse pipeline, including structure and transformation trade-offs.

snowflake schemastar schemaData ModelingReplit
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3
More topics1 question · ~9 min
Use Replit API for Usage StatsMedium

Tests your ability to integrate APIs into reliable ingestion and transform workflows.

api integrationData StructuresscriptingReplit
The finish line: interview-readyComplete all 41 questions plus 1 hands-on drill to finish this plan.